STMicroelectronics
SC23Z018 and 7
derivative products
with optional
cryptographic library
Neslib 3.1
Security Target - Public
Version
Common Criteria for IT security
evaluation
SMD_SC23Z018_ST_13_001 Rev 01.04
September 2013
BLANK
September 2013 SMD_SC23Z018_ST_13_001 Rev 01.04 3/55
SC23Z018 and 7 derivative products
Security Target - Public Version
Common Criteria for IT security evaluation
1 Introduction
1.1 Security Target reference
1 Document identification: SC23Z018A and 7 derivative products, with optional cryptographic
library Neslib 3.1 SECURITY TARGET - PUBLIC VERSION.
2 Version number: Rev 01.04, issued September 2013.
3 Registration: registered at ST Microelectronics under number
SMD_SC23Z018_ST_13_001_V01.04.
1.2 Purpose
4 This document presents the Security Target - Public version (ST) of the SC23Z018A,
SC23ZD12A, SC23ZD08A, SC23ZD04A, SB23ZD18A, SB23ZD12A, SB23ZD08A,
SB23ZD04A, Security Integrated Circuits (IC), with Dedicated Software (DSW), and
optional cryptographic library Neslib 3.1, designed on the ST23 platform of
STMicroelectronics.
5 This document is a sanitized version of the Security Target used for the evaluation. It is
classified as public information.
6 The precise reference of the Target of Evaluation (TOE) and the security IC features are
given in Section 3: TOE description.
7 A glossary of terms and abbreviations used in this document is given in Appendix A:
Glossary.
www.st.com
Contents Sx23Zxxx Security Target - Public Version
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Contents
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Security Target reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Context . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3 TOE description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1 TOE overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2 TOE life cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.3 TOE environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.3.1 TOE development environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.3.2 TOE production environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.3.3 TOE operational environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4 Conformance claims . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.1 Common Criteria conformance claims . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.2 PP Claims . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.2.1 PP Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.2.2 PP Refinements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.2.3 PP Additions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.2.4 PP Claims rationale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5 Security problem definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.1 Description of assets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.2 Threats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.3 Organisational security policies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.4 Assumptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6 Security objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6.1 Security objectives for the TOE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6.2 Security objectives for the environment . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.3 Security objectives rationale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
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6.3.1 Organisational security policy "Additional Specific Security Functionality"
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
6.3.2 Organisational security policy "Additional Specific Security Functionality"
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7 Security requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7.1 Security functional requirements for the TOE . . . . . . . . . . . . . . . . . . . . . . 28
7.1.1 Limited fault tolerance (FRU_FLT.2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.1.2 Failure with preservation of secure state (FPT_FLS.1) . . . . . . . . . . . . . 29
7.1.3 Limited capabilities (FMT_LIM.1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.1.4 Limited availability (FMT_LIM.2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.1.5 Audit storage (FAU_SAS.1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.1.6 Resistance to physical attack (FPT_PHP.3) . . . . . . . . . . . . . . . . . . . . . . 30
7.1.7 Basic internal transfer protection (FDP_ITT.1) . . . . . . . . . . . . . . . . . . . . 30
7.1.8 Basic internal TSF data transfer protection (FPT_ITT.1) . . . . . . . . . . . . 30
7.1.9 Subset information flow control (FDP_IFC.1) . . . . . . . . . . . . . . . . . . . . 31
7.1.10 Random number generation (FCS_RNG.1) . . . . . . . . . . . . . . . . . . . . . . 31
7.1.11 Cryptographic operation (FCS_COP.1) . . . . . . . . . . . . . . . . . . . . . . . . . 31
7.1.12 Cryptographic key generation (FCS_CKM.1) . . . . . . . . . . . . . . . . . . . . 32
7.1.13 Static attribute initialisation (FMT_MSA.3) . . . . . . . . . . . . . . . . . . . . . . . 32
7.1.14 Management of security attributes (MSA.1) . . . . . . . . . . . . . . . . . . . . . 33
7.1.15 Complete access control (FDP_ACC.2) . . . . . . . . . . . . . . . . . . . . . . . . 33
7.1.16 Security attribute based access control (FDP_ACF.1) . . . . . . . . . . . . . . 33
7.1.17 Specification of management functions (FMT_SMF.1) . . . . . . . . . . . . . 34
7.2 TOE security assurance requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
7.3 Refinement of the security assurance requirements . . . . . . . . . . . . . . . . 35
7.3.1 Refinement regarding functional specification (ADV_FSP) . . . . . . . . . . 35
7.3.2 Refinement regarding test coverage (ATE_COV) . . . . . . . . . . . . . . . . . 36
7.4 Security Requirements rationale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
7.4.1 Rationale for the Security Functional Requirements . . . . . . . . . . . . . . . 36
7.4.2 Additional security objectives are suitably addressed . . . . . . . . . . . . . . 37
7.4.3 Additional security requirements are consistent . . . . . . . . . . . . . . . . . . 38
7.4.4 Dependencies of Security Functional Requirements . . . . . . . . . . . . . . . 38
7.4.5 Rationale for the Assurance Requirements . . . . . . . . . . . . . . . . . . . . . . 40
8 TOE summary specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
8.1 Limited fault tolerance (FRU_FLT.2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
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8.2 Failure with preservation of secure state (FPT_FLS.1) . . . . . . . . . . . . . . 41
8.3 Limited capabilities (FMT_LIM.1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
8.4 Limited availability (FMT_LIM.2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
8.5 Audit storage (FAU_SAS.1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
8.6 Resistance to physical attack (FPT_PHP.3) . . . . . . . . . . . . . . . . . . . . . . . 42
8.7 Basic internal transfer protection (FDP_ITT.1), Basic internal TSF data
transfer protection (FPT_ITT.1) & Subset information flow control
(FDP_IFC.1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
8.8 Random number generation (FCS_RNG.1) . . . . . . . . . . . . . . . . . . . . . . . 42
8.9 Cryptographic operation: DES / 3DES operation (FCS_COP.1 [EDES]) . 42
8.10 Cryptographic operation: RSA operation (FCS_COP.1 [RSA]) if Neslib only
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
8.11 Cryptographic operation: AES operation (FCS_COP.1 [AES]) if Neslib only
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
8.12 Cryptographic operation: Elliptic Curves Cryptography operation
(FCS_COP.1 [ECC]) if Neslib only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
8.13 Cryptographic operation: SHA operation (FCS_COP.1 [SHA]) if Neslib only
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
8.14 Cryptographic key generation: Prime generation (FCS_CKM.1
[Prime_generation]) if Neslib only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
8.15 Cryptographic key generation: Protected Prime generation (FCS_CKM.1
[PROTECTED_Prime_generation]) if Neslib only . . . . . . . . . . . . . . . . . . . 44
8.16 Cryptographic key generation: RSA key generation (FCS_CKM.1
[RSA_Key_generation]) if Neslib only . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
8.17 Cryptographic key generation: PROTECTED RSA key generation
(FCS_CKM.1 [PROTECTED_RSA_Key_generation]) if Neslib only . . . . . 44
8.18 Static attribute initialisation (FMT_MSA.3) . . . . . . . . . . . . . . . . . . . . . . . . 44
8.19 Management of security attributes (FMT_MSA.1) & Specification of
management functions (FMT_SMF.1) . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
8.20 Complete access control (FDP_ACC.2) & Security attribute based access
control (FDP_ACF.1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
9 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Appendix A Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
A.1 Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
A.2 Abbreviations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
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10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
List of tables Sx23Zxxx Security Target - Public Version
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List of tables
Table 1. Master product and derivatives common characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 2. Master product and derivatives specific characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 3. Composite product life cycle phases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 4. Summary of security environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Table 5. Summary of security objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Table 6. Security Objectives versus Assumptions, Threats or Policies . . . . . . . . . . . . . . . . . . . . . . 26
Table 7. Summary of functional security requirements for the TOE . . . . . . . . . . . . . . . . . . . . . . . . . 28
Table 8. FCS_COP.1 iterations (cryptographic operations) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Table 9. FCS_CKM.1 iterations (cryptographic key generation). . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Table 10. TOE security assurance requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Table 11. Impact of EAL5 selection on BSI-PP-0035 refinements . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Table 12. Dependencies of security functional requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Table 13. List of abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Table 14. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Sx23Zxxx Security Target - Public Version List of figures
SMD_SC23Z018_ST_13_001 9/55
List of figures
Figure 1. Sx23Zxxx block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Context Sx23Zxxx Security Target - Public Version
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2 Context
8 The Target of Evaluation (TOE) referred to in Section 3: TOE description, is evaluated under
the French IT Security Evaluation and Certification Scheme and is developed by the Secure
Microcontrollers Division of STMicroelectronics (ST).
9 The Target of Evaluation (TOE) is the SC23Z018A with 7 commercial derivative products:
SC23ZD12A, SC23ZD08A, SC23ZD04A, SB23ZD18A, SB23ZD12A, SB23ZD08A, and
SB23ZD04A, with or without the cryptographic library Neslib 3.1.
10 The assurance level of the performed Common Criteria (CC) IT Security Evaluation is EAL 5
augmented.
11 The intent of this Security Target is to specify the Security Functional Requirements (SFRs)
and Security Assurance Requirements (SARs) applicable to the TOE security IC, and to
summarise its chosen TSF services and assurance measures.
12 This ST claims to be an instantiation of the "Security IC Platform Protection Profile" (PP)
registered and certified under the reference BSI-PP-0035 in the German IT Security
Evaluation and Certification Scheme, with the following augmentations:
● Addition #1: “Support of Cipher Schemes” from AUG,
● Addition #4: “Area based memory access control” from AUG.
The original text of this PP is typeset as indicated here, its augmentation from AUG is
indicated here, when they are reproduced in this document.
13 Extensions introduced in this ST to the SFRs of the Protection Profile (PP) are exclusively
drawn from the Common Criteria part 2 standard SFRs.
14 This ST makes various refinements to the above mentioned PP and AUG. They are all
properly identified in the text typeset as indicated here. The original text of the PP is
repeated as scarcely as possible in this document for reading convenience. All PP identifiers
have been however prefixed by their respective origin label: BSI for BSI-PP-0035, AUG1 for
Addition #1 of AUG, and AUG4 for Addition #4 of AUG.
Sx23Zxxx Security Target - Public Version TOE description
SMD_SC23Z018_ST_13_001 11/55
3 TOE description
3.1 TOE overview
15 The Target of Evaluation (TOE) comprises the SC23Z018A with 7 commercial derivatives:
the SC23ZD12A, SC23ZD08A, SC23ZD04A, SB23ZD18A, SB23ZD12A, SB23ZD08A, and
SB23ZD04A. Some of them may include the optional cryptographic library Neslib 3.1.
The master product is the SC23Z018A. All based on the same hardware design, the
different derivatives are configured during the manufacturing or packaging process, in
conformance with the customer’s order.
16 All products of the TOE share the same hardware design, and the same maskset, thus
mainly share the same characteristics:
17 The commercial version (aka external version) is updated when hardware or OST
modification has a visible impact for the customer.
18 The product version (aka internal version) is updated when hardware or OST is modified.
This letter completely identifies the product version.
19 The different derivative products differ from the master product, only on the available NVM
size, and on the availability of the cryptographic co-processor (NESCRYPT), as detailed
here below:
20 The master product and the different derivative products can be distinguished thanks to the
product identification number, included in the traceability number, as detailed in Table 2:
Master product and derivatives specific characteristics and in the data sheet.
Table 1. Master product and derivatives common characteristics
Maskset
Commercial
version
Product
version
OST name
OST
revision
Optional crypto
library name
Crypto library
revision(1)
1. See the Neslib User Manual referenced in Chapter 9.
K390A A C YIB 0063h Neslib 3.1 1310h
Table 2. Master product and derivatives specific characteristics
Commercial name Product identification(1)
1. Part of the product information.
NVM size NESCRYPT
SC23Z018 003Ah 18 Kbytes Yes
SC23ZD12 003Bh 12 Kbytes Yes
SC23ZD08 003Ch 8 Kbytes Yes
SC23ZD04 003Dh 4 Kbytes Yes
SB23ZD18 003Eh 18 Kbytes No
SB23ZD12 003Fh 12 Kbytes No
SB23ZD08 0040h 8 Kbytes No
SB23ZD04 0041h 4 Kbytes No
TOE description Sx23Zxxx Security Target - Public Version
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21 In this Security Target, the terms:
● "TOE" or "Sx23Zxxx" or "SC23Z018A and 7 derivative products" mean all products
listed in Table 2: Master product and derivatives specific characteristics,
● "SC23Zxxx" means the subset of products SC23Z018, SC23ZD12, SC23Z08,
SC23Z04,
● "SB23Zxxx" means the subset of products SB23ZD18, SB23ZD12, SB23ZD08,
SB23ZD04.
22 The rest of this document applies to all products, with or without Neslib, except when a
restriction is mentioned. For easier reading, the restrictions are typeset as indicated here.
23 The SC23Zxxx is a Secure IC with 18, 12, 8 or 4 Kbytes EEPROM (see Table 2: Master
product and derivatives specific characteristics), with Nescrypt cryptoprocessor.
24 The SB23Zxxx is a Secure IC with 18, 12, 8 or 4 Kbytes EEPROM (see Table 2: Master
product and derivatives specific characteristics), without Nescrypt cryptoprocessor.
25 The TOE is a serial access IC based on a 8/16-bit CPU core. Operations are synchronized
with an internally generated clock issued by the Clock Generator module. The internal
speed of the device is fully software programmable. High performance can be reached by
using high speed internal clock frequency (up to 28 MHz). The CPU interfaces with the on-
chip RAM, ROM and EEPROM memories via a 24-bit internal bus offering 16 MBytes of
linear addressing space.
26 The CPU includes the Arithmetic Logic Unit (ALU) and the control logic.
27 This device includes a flexible memory protection unit (MPU), which enables a fully dynamic
memory segmentation and protection without downgrading the CPU performance. The MPU
enables the software to control the addressable space and registers available to any given
program, thanks to a flexible and software-friendly interface. As a result, the MPU allows the
software developers to enforce a wide range of memory protection policies.
28 The 3-key Triple DES accelerator (EDES+) enablesCipher Block Chaining (CBC) [10], fast
DES and triple DES computation [2]. This module provides an enhanced protection against
side channel attacks (DPA and DEMA).
29 For the SC23Zxxx, the NExt Step CRYPTography accelerator (NESCRYPT) enables
efficient computation for both GF(p) and GF(2n
) with a very high level of performance.
NESCRYPT also includes dedicated instructions to accelerate hash function SHA-1 and
SHA-2 family. NESCRYPT allows fast and secure implementation of the most popular public
key cryptosystems with a high level of performance ([4], [8], [12], [18], [19], [20], [21]).
30 As randomness is a key stone in many applications, the SC23Z018 and 7 derivative
products features a highly reliable True Random Number Generator (TRNG), compliant with
P2 Class of AIS-31 [1] and directly accessible through dedicated registers.
31 In a few words, the Sx23Zxxx offers a unique combination of high performances and very
powerful features for high level security:
● Die integrity,
● Monitoring of environmental parameters,
● Protection mechanisms against faults,
● AIS-31 class P2 compliant True Random Number Generator,
● EDES+ accelerator,
● NESCRYPT accelerator in the SC23Zxxx.
Sx23Zxxx Security Target - Public Version TOE description
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32 The TOE includes in the ST protected ROM a Dedicated Software which provides full test
capabilities (operating system for test, called “OST”), not accessible by the Security IC
Embedded Software (ES), after TOE delivery.
33 The Security IC Embedded Software (ES) is in User ROM.
The ES is not part of the TOE and is out of scope of the evaluation, except Neslib when it is
embedded.
34 The SC23Zxxx optionally comprises a specific application in User ROM: this applicative
Embedded Software is a cryptographic library called Neslib. Neslib is a cutting edge
cryptographic library in terms of security and performance.
35 Neslib is embedded by the ES developper in his applicative code.
36 Neslib provides the most useful operations in public key algorithms and protocols, thanks to:
● an asymmetric key cryptographic support module, supporting secure modular
arithmetic with large integers, with specialized functions for Rivest, Shamir & Adleman
Standard cryptographic algorithm (RSA [20]),
● an asymmetric key cryptographic support module that provides very efficient basic
functions to build up protocols using Elliptic Curves Cryptography on prime fields GF(p)
[18],
● an asymmetric key cryptographic support module that provides secure hash algorithm
functions (SHA) [4],
● a symmetric key cryptographic support module whose base algorithm is the Advanced
Encryption Standard cryptographic algorithm (AES [7]),
● prime number generation.
37 In addition, the ROM of the tested samples contains an operating system called “Card
Manager” that allows the evaluators to use a set of commands with the I/O, and to load in
EEPROM (or in RAM) test software. The card manager is not part of the TOE, and not in the
scope of this evaluation.
38 The user guidance documentation, part of the TOE, consists of:
● The product Data Sheet,
● The product family Security Guidance,
● The AIS31 user manuals,
● The product family programming manual,
● Optionally the Neslib user manual.
The complete list of guidance documents is detailed in Chapter 9.
39 Figure 1 provides an overview of the Sx23zxxx.
TOE description Sx23Zxxx Security Target - Public Version
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Figure 1. Sx23Zxxx block diagram
3.2 TOE life cycle
40 This Security Target is fully conform to the claimed PP. In the following, just a summary and
some useful explanations are given. For complete details on the TOE life cycle, please refer
to the Security IC Platform Protection Profile (BSI-PP-0035), section 1.2.3.
41 The composite product life cycle is decomposed into 7 phases. Each of these phases has
the very same boundaries as those defined in the claimed protection profile.
42 The life cycle phases are summarized in Table 3.
43 The limit of the evaluation corresponds to phases 2, 3 and optionally 4, including the
delivery and verification procedures of phase 1, and the TOE delivery either to the IC
packaging manufacturer or to the composite product integrator ; procedures corresponding
to phases 1, 5, 6 and 7 are outside the scope of this evaluation.
Table 3. Composite product life cycle phases
Phase Name Description Responsible party
1
IC embedded software
development
Security IC embedded software
development
IC embedded software
developer
2 IC development
IC design
IC dedicated software development
IC developer: ST
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44 The TOE is delivered after Phase 3 in form of wafers or after Phase 4 in packaged form,
depending on the customer’s order.
45 In the following, the term "TOE delivery" is uniquely used to indicate:
● after Phase 3 (or before Phase 4) if the TOE is delivered in form of wafers or sawn
wafers (dice) or
● after Phase 4 (or before Phase 5) if the TOE is delivered in form of packaged products.
46 The TOE is only delivered in USER configuration.
3.3 TOE environment
47 Considering the TOE, three types of environments are defined:
● Development environment corresponding to phase 2,
● Production environment corresponding to phase 3 and optionally 4,
● Operational environment, including phase 1 and from phase 4 or 5 to phase 7.
3.3.1 TOE development environment
48 To ensure security, the environment in which the development takes place is secured with
controllable accesses having traceability. Furthermore, all authorised personnel involved
fully understand the importance and the strict implementation of defined security
procedures.
49 The development begins with the TOE's specification. All parties in contact with sensitive
information are required to abide by Non-Disclosure Agreements.
50 Design and development of the IC then follows, together with the dedicated and engineering
software and tools development. The engineers use secure computer systems (preventing
unauthorised access) to make their developments, simulations, verifications and generation
of the TOE's databases. Sensitive documents, files and tools, databases on tapes, and
3 IC manufacturing
integration and photomask fabrication
IC production
IC testing
preparation
pre-personalisation
IC manufacturer: ST or
GLOBAL FOUNDRIES
4 IC packaging
security IC packaging (and testing)
pre-personalisation if necessary
IC packaging
manufacturer: ST or
NEDCARD or SMARTFLEX
5
Composite product
integration
composite product finishing process
composite product preparation
composite product shipping
Composite product
integrator
6 Personalisation
composite product personalisation
composite product testing
Personaliser
7 Operational usage
composite product usage by its
issuers and consumers
End-consumer
Table 3. Composite product life cycle phases (continued)
Phase Name Description Responsible party
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printed circuit layout information are stored in appropriate locked cupboards/safe. Of
paramount importance also is the disposal of unwanted data (complete electronic erasures)
and documents (e.g. shredding).
51 The development centres involved in the development of the TOE are the following: ST
ROUSSET (FRANCE) and ST ANG MO KIO (SINGAPORE), for the design activities, ST ROUSSET
(FRANCE), for the engineering activities, ST ROUSSET (FRANCE) and ST ZAVENTEM (BELGIUM)
for the software development activities.
52 Reticules and photomasks are generated from the verified IC databases; the former are
used in the silicon Wafer-fab processing. As reticules and photomasks are generated off-
site, they are transported and worked on in a secure environment with accountability and
traceability of all (good and bad) products. During the transfer of sensitive data
electronically, procedures are established to ensure that the data arrive only at the
destination and are not accessible at intermediate stages (e.g. stored on a buffer server
where system administrators make backup copies).
53 The authorized sub-contractors involved in the TOE mask manufacturing can be DNP
(JAPAN) and DPE (ITALY).
3.3.2 TOE production environment
54 As high volumes of product commonly go through such environments, adequate control
procedures are necessary to account for all product at all stages of production.
55 Production starts within the Wafer-fab; here the silicon wafers undergo the diffusion
processing. Computer tracking at wafer level throughout the process is commonplace. The
wafers are then taken into the test area. Testing of each TOE occurs to assure conformance
with the device specification.
56 The authorized front-end plant involved in the manufacturing of the TOE can be ST ROUSSET
(FRANCE) or GLOBAL FOUNDRIES FAB 2 & 6 (SINGAPORE).
57 The authorized EWS plant involved in the testing of the TOE can be ST ROUSSET (FRANCE)
or ST TOA PAYOH (SINGAPORE).
58 Wafers are then scribed and broken such as to separate the functional from the non-
functional ICs. The latter is discarded in a controlled accountable manner. The good ICs are
then packaged in phase 4, in a back-end plant. When testing, programming or deliveries are
done offsite, ICs are transported and worked on in a secure environment with accountability
and traceability of all (good and bad) products.
59 When the product is delivered after phase 4, the authorized back-end plant involved in the
packaging of the TOE can be ST BOUSKOURA (MOROCCO), ST CALAMBA (PHILIPPINES),
NEDCARD (THE NETHERLANDS) or SMARTFLEX (SINGAPORE).
60 The other sites that can be involved during the production of the TOE are ST LOYANG
(SINGAPORE) for the logistics, and ST SHENZEN (CHINA) or DISCO (GERMANY) for the wafers
backlap and sawing.
3.3.3 TOE operational environment
61 A TOE operational environment is the environment of phases 1, optionally 4, then 5 to 7.
62 At phases 1, 4, 5 and 6, the TOE operational environment is a controlled environment.
63 End-user environments (phase 7): composite products are used in a wide range of
applications to assure authorised conditional access. Examples of such are pay-TV, banking
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cards, portable communication SIM cards, brand protection, health cards, transportation
cards, identity and passport cards. The end-user environment therefore covers a wide range
of very different functions, thus making it difficult to avoid and monitor any abuse of the TOE.
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4 Conformance claims
4.1 Common Criteria conformance claims
64 The Sx23Zxxx Security Target claims to be conformant to the Common Criteria version 3.1.
65 Furthermore it claims to be CC Part 2 (CCMB-2009-07-002) extended and CC Part 3
(CCMB-2009-07-003) conformant. The extended Security Functional Requirements are
those defined in the Security IC Platform Protection Profile (BSI-PP-0035).
66 The assurance level for this Security Target is EAL 5 augmented by ALC_DVS.2 and
AVA_VAN.5.
4.2 PP Claims
4.2.1 PP Reference
67 This Security Target claims strict conformance to the Security IC Platform Protection Profile
(BSI-PP-0035), as required by this Protection Profile.
4.2.2 PP Refinements
68 The main refinements operated on the BSI-PP-0035 are:
● Addition #1: “Support of Cipher Schemes” from AUG,
● Addition #4: “Area based Memory Access Control” from AUG,
● Refinement of assurance requirements.
69 All refinements are indicated with type setting text as indicated here, original text from the
BSI-PP-0035 being typeset as indicated here. Text originating in AUG is typeset as indicated
here.
4.2.3 PP Additions
70 The security environment additions relative to the PP are summarized in Table 4.
71 The additional security objectives relative to the PP are summarized in Table 5.
72 A simplified presentation of the TOE Security Policy (TSP) is added.
73 The additional SFRs for the TOE relative to the PP are summarized in Table 7.
74 The additional SARs relative to the PP are summarized in Table 10.
4.2.4 PP Claims rationale
75 The differences between this Security Target security objectives and requirements and
those of BSI-PP-0035, to which conformance is claimed, have been identified and justified
in Section 6 and in Section 7. They have been recalled in the previous section.
76 In the following, the statements of the security problem definition, the security objectives,
and the security requirements are consistent with those of the BSI-PP-0035.
77 The security problem definition presented in Section 5, clearly shows the additions to the
security problem statement of the PP.
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78 The security objectives rationale presented in Section 6.3 clearly identifies modifications
and additions made to the rationale presented in the BSI-PP-0035.
79 Similarly, the security requirements rationale presented in Section 7.4 has been updated
with respect to the protection profile.
80 All PP requirements have been shown to be satisfied in the extended set of requirements
whose completeness, consistency and soundness has been argued in the rationale sections
of the present document.
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5 Security problem definition
81 This section describes the security aspects of the environment in which the TOE is intended
to be used and addresses the description of the assets to be protected, the threats, the
organisational security policies and the assumptions.
82 This Security Target being fully conform to the claimed PP, in the following, just a summary
and some useful explanations are given. For complete details on the security problem
definition please refer to the Security IC Platform Protection Profile (BSI-PP-0035), section
3.
83 A summary of all these security aspects and their respective conditions is provided in
Table 4.
5.1 Description of assets
84 The assets (related to standard functionality) to be protected are:
● the User Data,
● the Security IC Embedded Software, stored and in operation,
● the security services provided by the TOE for the Security IC Embedded Software.
85 The user (consumer) of the TOE places value upon the assets related to high-level security
concerns:
SC1 integrity of User Data and of the Security IC Embedded Software (while being
executed/processed and while being stored in the TOE's memories),
SC2 confidentiality of User Data and of the Security IC Embedded Software (while being
processed and while being stored in the TOE's memories)
SC3 correct operation of the security services provided by the TOE for the Security IC
Embedded Software.
86 According to the Protection Profile there is the following high-level security concern related to
security service:
SC4 deficiency of random numbers.
87 To be able to protect these assets the TOE shall protect its security functionality. Therefore
critical information about the TOE shall be protected. Critical information includes:
● logical design data, physical design data, IC Dedicated Software, and configuration
data,
● Initialisation Data and Pre-personalisation Data, specific development aids, test and
characterisation related data, material for software development support, and
photomasks.
Such information and the ability to perform manipulations assist in threatening the above
assets.
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88 The information and material produced and/or processed by ST in the TOE development
and production environment (Phases 2 up to TOE delivery) can be grouped as follows:
● logical design data,
● physical design data,
● IC Dedicated Software, Security IC Embedded Software, Initialisation Data and pre-
personalisation Data,
● specific development aids,
● test and characterisation related data,
● material for software development support, and
● photomasks and products in any form
as long as they are generated, stored, or processed by ST.
5.2 Threats
89 The threats are described in the BSI-PP-0035, section 3.2. Only those originating in AUG
are detailed in the following section.
Table 4. Summary of security environment
Label Title
TOE
threats
BSI.T.Leak-Inherent Inherent Information Leakage
BSI.T.Phys-Probing Physical Probing
BSI.T.Malfunction Malfunction due to Environmental Stress
BSI.T.Phys-Manipulation Physical Manipulation
BSI.T.Leak-Forced Forced Information Leakage
BSI.T.Abuse-Func Abuse of Functionality
BSI.T.RND Deficiency of Random Numbers
AUG4.T.Mem-Access Memory Access Violation
OSPs
BSI.P.Process-TOE Protection during TOE Development and Production
AUG1.P.Add-Functions Additional Specific Security Functionality (Cipher Scheme
Support)
Assumptions
BSI.A.Process-Sec-IC Protection during Packaging, Finishing and Personalisation
BSI.A.Plat-Appl Usage of Hardware Platform
BSI.A.Resp-Appl Treatment of User Data
BSI.T.Leak-Inherent Inherent Information Leakage
BSI.T.Phys-Probing Physical Probing
BSI.T.Malfunction Malfunction due to Environmental Stress
BSI.T.Phys-Manipulation Physical Manipulation
BSI.T.Leak-Forced Forced Information Leakage
BSI.T.Abuse-Func Abuse of Functionality
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5.3 Organisational security policies
90 The TOE provides specific security functionality that can be used by the Security IC
Embedded Software. In the following specific security functionality is listed which is not
derived from threats identified for the TOE’s environment because it can only be decided in
the context of the Security IC application, against which threats the Security IC Embedded
Software will use the specific security functionality.
91 ST applies the Protection policy during TOE Development and Production (BSI.P.Process-
TOE) as specified below.
92 ST applies the Additional Specific Security Functionality policy (AUG1.P.Add-Functions) as
specified below.
93 No other Organisational Security Policy (OSP) has been defined in this ST since their
specifications depend heavily on the applications in which the TOE will be integrated. The
Security Targets for the applications embedded in this TOE should further define them.
BSI.T.RND Deficiency of Random Numbers
AUG4.T.Mem-Access Memory Access Violation:
Parts of the Security IC Embedded Software may cause security violations
by accidentally or deliberately accessing restricted data (which may include
code). Any restrictions are defined by the security policy of the specific
application context and must be implemented by the Security IC
Embedded Software.
Clarification: This threat does not address the proper definition and
management of the security rules implemented by the Security IC
Embedded Software, this being a software design and correctness issue.
This threat addresses the reliability of the abstract machine targeted by the
software implementation. To avert the threat, the set of access rules
provided by this TOE should be undefeated if operated according to the
provided guidance. The threat is not realized if the Security IC Embedded
Software is designed or implemented to grant access to restricted
information. It is realized if an implemented access denial is granted under
unexpected conditions or if the execution machinery does not effectively
control a controlled access.
Here the attacker is expected to (i) take advantage of flaws in the design
and/or the implementation of the TOE memory access rules (refer to
BSI.T.Abuse-Func but for functions available after TOE delivery), (ii)
introduce flaws by forcing operational conditions (refer to
BSI.T.Malfunction) and/or by physical manipulation (refer to BSI.T.Phys-
Manipulation). This attacker is expected to have a high level potential of
attack.
BSI.P.Process-TOE Protection during TOE Development and Production:
An accurate identification is established for the TOE. This requires that
each instantiation of the TOE carries this unique identification.
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5.4 Assumptions
94 The assumptions are described in the BSI-PP-0035, section 3.4.
AUG1.P.Add-Functions Additional Specific Security Functionality:
The TOE shall provide the following specific security functionality to the
Security IC Embedded Software:
– Data Encryption Standard (DES),
– Triple Data Encryption Standard (3DES),
– Advanced Encryption Standard (AES): when Neslib is embedded only,
– Elliptic Curves Cryptography on GF(p): when Neslib is embedded
only,
– Secure Hashing (SHA-1, SHA-224, SHA-256, SHA-384, SHA-512):
when Neslib is embedded only,
– Rivest-Shamir-Adleman (RSA): when Neslib is embedded only,
– Prime Number Generation: when Neslib is embedded only.
Note that DES is no longer recommended as an encryption function in the
context of smart card applications. Hence, Security IC Embedded Software
may need to use triple DES to achieve a suitable strength.
BSI.A.Process-Sec-IC Protection during Packaging, Finishing and Personalisation
BSI.A.Plat-Appl Usage of Hardware Platform
BSI.A.Resp-Appl Treatment of User Data
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6 Security objectives
95 The security objectives of the TOE cover principally the following aspects:
● integrity and confidentiality of assets,
● protection of the TOE and associated documentation during development and
production phases,
● provide random numbers,
● provide cryptographic support and access control functionality.
96 A summary of all security objectives is provided in Table 5. Note that the origin of each
objective is clearly identified in the prefix of its label.
97 Most of these security aspects can therefore be easily found in the protection profile. Only
those originating in AUG are detailed in the following sections.
6.1 Security objectives for the TOE
Table 5. Summary of security objectives
Label Title
TOE
BSI.O.Leak-Inherent Protection against Inherent Information Leakage
BSI.O.Phys-Probing Protection against Physical Probing
BSI.O.Malfunction Protection against Malfunctions
BSI.O.Phys-Manipulation Protection against Physical Manipulation
BSI.O.Leak-Forced Protection against Forced Information Leakage
BSI.O.Abuse-Func Protection against Abuse of Functionality
BSI.O.Identification TOE Identification
BSI.O.RND Random Numbers
AUG1.O.Add-Functions Additional Specific Security Functionality
AUG4.O.Mem Access Dynamic Area based Memory Access Control
Environments
BSI.OE.Plat-Appl Usage of Hardware Platform
BSI.OE.Resp-Appl Treatment of User Data
BSI.OE.Process-Sec-IC Protection during composite product manufacturing
BSI.O.Leak-Inherent Protection against Inherent Information Leakage
BSI.O.Phys-Probing Protection against Physical Probing
BSI.O.Malfunction Protection against Malfunctions
BSI.O.Phys-Manipulation Protection against Physical Manipulation
BSI.O.Leak-Forced Protection against Forced Information Leakage
BSI.O.Abuse-Func Protection against Abuse of Functionality
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6.2 Security objectives for the environment
98 Security Objectives for the Security IC Embedded Software development environment
(phase 1):
99 Security Objectives for the operational Environment (TOE delivery up to end of phase 6):
6.3 Security objectives rationale
100 The main line of this rationale is that the inclusion of all the security objectives of the BSI-
PP-0035 protection profile, together with those in AUG, guarantees that all the security
environment aspects identified in Section 5 are addressed by the security objectives stated
in this chapter.
BSI.O.Identification TOE Identification
BSI.O.RND Random Numbers
AUG1.O.Add-Functions Additional Specific Security Functionality:
The TOE must provide the following specific security functionality to
the Security IC Embedded Software:
– Data Encryption Standard (DES),
– Triple Data Encryption Standard (3DES),
– Advanced Encryption Standard (AES): when Neslib is embedded
only,
– Elliptic Curves Cryptography on GF(p): when Neslib is
embedded only,
– Secure Hashing (SHA-1, SHA-224, SHA-256, SHA-384, SHA-
512): when Neslib is embedded only,
– Rivest-Shamir-Adleman (RSA): when Neslib is embedded only,
– Prime Number Generation: when Neslib is embedded only.
AUG4.O.Mem Access Dynamic Area based Memory Access Control:
The TOE must provide the Security IC Embedded Software with the
capability to define dynamic memory segmentation and
protection. The TOE must then enforce the defined access rules
so that access of software to memory areas is controlled as required,
for example, in a multi-application environment.
BSI.OE.Plat-Appl Usage of Hardware Platform
BSI.OE.Resp-Appl Treatment of User Data
BSI.OE.Process-Sec-IC Protection during composite product manufacturing
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101 Thus, it is necessary to show that:
● security environment aspects from AUG are addressed by security objectives stated in
this chapter,
● the security objectives from AUG are suitable (i.e. they address security environment
aspects),
● the security objectives from AUG are consistent with the other security objectives
stated in this chapter (i.e. no contradiction).
102 The selected augmentations from AUG introduce the following security environment aspect:
● TOE threat "Memory Access Violation, (AUG4.T.Mem-Access)",
● organisational security policy "Additional Specific Security Functionality, (AUG1.P.Add-
Functions)".
103 As required by CC Part 1 (CCMB-2009-07-001), no assumption nor objective for the
environment has been added to those of the BSI-PP-0035 Protection Profile to which strict
conformance is claimed.
104 The justification of the additional policy and the additional threat provided in the next
subsections shows that they do not contradict to the rationale already given in the protection
profile BSI-PP-0035 for the assumptions, policy and threats defined there.
6.3.1 TOE threat "Memory Access Violation"
105 The justification related to the threat “Memory Access Violation, (AUG4.T.Mem-Access)” is
as follows:
Table 6. Security Objectives versus Assumptions, Threats or Policies
Assumption, Threat or Organisational
Security Policy
Security Objective Notes
BSI.A.Plat-Appl BSI.OE.Plat-Appl Phase 1
BSI.A.Resp-Appl BSI.OE.Resp-Appl Phase 1
BSI.P.Process-TOE BSI.O.Identification
Phase 2-3
optional
Phase 4
BSI.A.Process-Sec-IC BSI.OE.Process-Sec-IC
Phase 5-6
optional
Phase 4
BSI.T.Leak-Inherent BSI.O.Leak-Inherent
BSI.T.Phys-Probing BSI.O.Phys-Probing
BSI.T.Malfunction BSI.O.Malfunction
BSI.T.Phys-Manipulation BSI.O.Phys-Manipulation
BSI.T.Leak-Forced BSI.O.Leak-Forced
BSI.T.Abuse-Func BSI.O.Abuse-Func
BSI.T.RND BSI.O.RND
AUG1.P.Add-Functions AUG1.O.Add-Functions
AUG4.T.Mem-Access AUG4.O.Mem Access
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106 According to AUG4.O.Mem Access the TOE must enforce the dynamic memory
segmentation and protection so that access of software to memory areas is controlled.
Any restrictions are to be defined by the Security IC Embedded Software. Thereby security
violations caused by accidental or deliberate access to restricted data (which may include
code) can be prevented (refer to AUG4.T.Mem-Access). The threat AUG4.T.Mem-Access is
therefore removed if the objective is met.
107 The added objective for the TOE AUG4.O.Mem Access does not introduce any contradiction
in the security objectives for the TOE.
6.3.2 Organisational security policy "Additional Specific Security
Functionality"
108 The justification related to the organisational security policy "Additional Specific Security
Functionality, (AUG1.P.Add-Functions)” is as follows:
109 Since AUG1.O.Add-Functions requires the TOE to implement exactly the same specific
security functionality as required by AUG1.P.Add-Functions, and in the very same
conditions, the organisational security policy is covered by the objective.
110 Nevertheless the security objectives BSI.O.Leak-Inherent, BSI.O.Phys-Probing, ,
BSI.O.Malfunction, BSI.O.Phys-Manipulation and BSI.O.Leak-Forced define how to
implement the specific security functionality required by AUG1.P.Add-Functions. (Note that
these objectives support that the specific security functionality is provided in a secure way
as expected from AUG1.P.Add-Functions.) Especially BSI.O.Leak-Inherent and BSI.O.Leak-
Forced refer to the protection of confidential data (User Data or TSF data) in general. User
Data are also processed by the specific security functionality required by AUG1.P.Add-
Functions.
111 The added objective for the TOE AUG1.O.Add-Functions does not introduce any
contradiction in the security objectives for the TOE.
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7 Security requirements
112 This chapter on security requirements contains a section on security functional
requirements (SFRs) for the TOE (Section 7.1), a section on security assurance
requirements (SARs) for the TOE (Section 7.2), a section on the refinements of these SARs
(Section 7.3) as required by the "BSI-PP-0035" Protection Profile. This chapter includes a
section with the security requirements rationale (Section 7.4).
7.1 Security functional requirements for the TOE
113 Security Functional Requirements (SFRs) from the "BSI-PP-0035" Protection Profile (PP)
are drawn from CCMB-2009-07-002, except the following SFRs, that are extensions to
CCMB-2009-07-002:
● FCS_RNG Generation of random numbers,
● FMT_LIM Limited capabilities and availability,
● FAU_SAS Audit data storage.
The reader can find their certified definitions in the text of the "BSI-PP-0035" Protection
Profile.
114 All extensions to the SFRs of the "BSI-PP-0035" Protection Profiles (PPs) are exclusively
drawn from CCMB-2009-07-002.
115 All iterations, assignments, selections, or refinements on SFRs have been performed
according to section C.4 of CCMB-2009-07-001. They are easily identified in the following
text as they appear as indicated here. Note that in order to improve readability, iterations
are sometimes expressed within tables.
116 In order to ease the definition and the understanding of these security functional
requirements, a simplified presentation of the TOE Security Policy (TSP) is given in the
following section.
117 The selected security functional requirements for the TOE, their respective origin and type
are summarized in Table 7.
Table 7. Summary of functional security requirements for the TOE
Label Title Addressing Origin Type
FRU_FLT.2 Limited fault tolerance
Malfunction BSI-PP-0035
CCMB-2009-07-002
FPT_FLS.1
Failure with preservation
of secure state
FMT_LIM.1 Limited capabilities
Abuse of functionality BSI-PP-0035
Extended
FMT_LIM.2 Limited availability
FAU_SAS.1 Audit storage Lack of TOE identification
BSI-PP-0035
Operated
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7.1.1 Limited fault tolerance (FRU_FLT.2)
118 The TSF shall ensure the operation of all the TOE’s capabilities when the following failures
occur: exposure to operating conditions which are not detected according to the
requirement Failure with preservation of secure state (FPT_FLS.1).
7.1.2 Failure with preservation of secure state (FPT_FLS.1)
119 The TSF shall preserve a secure state when the following types of failures occur: exposure
to operating conditions which may not be tolerated according to the requirement
Limited fault tolerance (FRU_FLT.2) and where therefore a malfunction could occur.
120 Refinement:
The term “failure” above also covers “circumstances”. The TOE prevents failures for the
“circumstances” defined above.
Regarding application note 15 of BSI-PP-0035, the TOE provides information on the
operating conditions monitored during Security IC Embedded Software execution and after
a warm reset. No audit requirement is however selected in this Security Target.
FPT_PHP.3
Resistance to physical
attack
Physical manipulation &
probing
BSI-PP-0035
CCMB-2009-07-002
FDP_ITT.1
Basic internal transfer
protection
Leakage
FPT_ITT.1
Basic internal TSF data
transfer protection
FDP_IFC.1
Subset information flow
control
FCS_RNG.1
Random number
generation
Weak cryptographic
quality of random
numbers
BSI-PP-0035
Operated
Extended
FCS_COP.1 Cryptographic operation
Cipher scheme support
AUG #1
Operated
CCMB-2009-07-002
FCS_CKM.1
(if Neslib is
embedded
only)
Cryptographic key
generation
Security Target
Operated
FDP_ACC.2 Complete access control
Memory access violation
Security Target
Operated
FDP_ACF.1
Security attribute based
access control
AUG #4
Operated
FMT_MSA.3
Static attribute
initialisation
Correct operation
FMT_MSA.1
Management of security
attribute
FMT_SMF.1
Specification of
management functions
Security Target
Operated
Table 7. Summary of functional security requirements for the TOE (continued)
Label Title Addressing Origin Type
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7.1.3 Limited capabilities (FMT_LIM.1)
121 The TSF shall be designed and implemented in a manner that limits their capabilities so that
in conjunction with “Limited availability (FMT_LIM.2)” the following policy is enforced:
Limited capability and availability Policy.
7.1.4 Limited availability (FMT_LIM.2)
122 The TSF shall be designed and implemented in a manner that limits their availability so that
in conjunction with “Limited capabilities (FMT_LIM.1)” the following policy is enforced:
Limited capability and availability Policy.
123 SFP_1: Limited capability and availability Policy
Deploying Test Features after TOE Delivery does not allow User Data to be disclosed or
manipulated, TSF data to be disclosed or manipulated, software to be reconstructed and no
substantial information about construction of TSF to be gathered which may enable other
attacks.
7.1.5 Audit storage (FAU_SAS.1)
124 The TSF shall provide the test process before TOE Delivery with the capability to store
the Initialisation Data and/or Pre-personalisation Data and/or supplements of the
Security IC Embedded Software in the NVM.
7.1.6 Resistance to physical attack (FPT_PHP.3)
125 The TSF shall resist physical manipulation and physical probing, to the TSF by
responding automatically such that the SFRs are always enforced.
126 Refinement:
The TSF will implement appropriate mechanisms to continuously counter physical
manipulation and physical probing. Due to the nature of these attacks (especially
manipulation) the TSF can by no means detect attacks on all of its elements. Therefore,
permanent protection against these attacks is required ensuring that security functional
requirements are enforced. Hence, “automatic response” means here (i)assuming that there
might be an attack at any time and (ii)countermeasures are provided at any time.
7.1.7 Basic internal transfer protection (FDP_ITT.1)
127 The TSF shall enforce the Data Processing Policy to prevent the disclosure of user data
when it is transmitted between physically-separated parts of the TOE.
7.1.8 Basic internal TSF data transfer protection (FPT_ITT.1)
128 The TSF shall protect TSF data from disclosure when it is transmitted between separate
parts of the TOE.
129 Refinement:
The different memories, the CPU and other functional units of the TOE (e.g. a cryptographic
co-processor) are seen as separated parts of the TOE.
This requirement is equivalent to FDP_ITT.1 above but refers to TSF data instead of User
Data. Therefore, it should be understood as to refer to the same Data Processing Policy
defined under FDP_IFC.1 below.
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7.1.9 Subset information flow control (FDP_IFC.1)
130 The TSF shall enforce the Data Processing Policy on all confidential data when they are
processed or transferred by the TSF or by the Security IC Embedded Software.
131 SFP_2: Data Processing Policy
User Data and TSF data shall not be accessible from the TOE except when the Security IC
Embedded Software decides to communicate the User Data via an external interface. The
protection shall be applied to confidential data only but without the distinction of attributes
controlled by the Security IC Embedded Software.
7.1.10 Random number generation (FCS_RNG.1)
132 The TSF shall provide a physical random number generator that implements a total failure
test of the random source.
133 The TSF shall provide random numbers that meet P2 class of BSI-AIS31.
7.1.11 Cryptographic operation (FCS_COP.1)
134 The TSF shall perform the operations in Table 8 in accordance with a specified
cryptographic algorithm in Table 8 and cryptographic key sizes of Table 8 that meet the
standards in Table 8. The list of operations depends on the presence of Neslib, as
indicated in Table 8 (Restrict).
Table 8. FCS_COP.1 iterations (cryptographic operations)
Restrict Iteration label
[assignment: list of
cryptographic operations]
[assignment:
cryptographic
algorithm]
[assignment:
cryptographic
key sizes]
[assignment: list of
standards]
Even
without
Neslib
EDES
encryption
decryption
- in Cipher Block Chaining
(CBC) mode
- in Electronic Code Book
(ECB) mode
MAC computation in CBC-
MAC
Data Encryption
Standard (DES)
56 bits
FIPS PUB 46-3
ISO/IEC 9797-1
ISO/IEC 10116
Triple Data
Encryption
Standard
(3DES)
168 bits
If
Neslib
AES
encryption (cipher)
decryption (inverse cipher)
key expansion
andomize
Advanced
Encryption
Standard
128, 192 and
256 bits
FIPS PUB 197
If
Neslib
RSA
RSA public key operation
RSA private key operation
without the Chinese
Remainder Theorem
RSA private key operation
with the Chinese Remainder
Theorem
Rivest, Shamir &
Adleman’s
up to 4096 bits PKCS #1 V2.1
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7.1.12 Cryptographic key generation (FCS_CKM.1)
135 If Neslib is embedded only, The TSF shall generate cryptographic keys in accordance with a
specified cryptographic key generation algorithm, in Table 9, and specified cryptographic
key sizes of Table 9 that meet the following standards in Table 9.
7.1.13 Static attribute initialisation (FMT_MSA.3)
136 The TSF shall enforce the Dynamic Memory Access Control Policy to provide minimally
protective(a)
default values for security attributes that are used to enforce the SFP.
If
Neslib
ECC
private scalar multiplication
prepare Jacobian
public scalar multiplication
point validity check
convert Jacobian to affine
coordinates
general point addition,
point expansion
point compression
Elliptic Curves
Cryptography on
GF(p)
up to 640 bits
IEEE 1363-2000,
chapter 7
IEEE 1363a-2004
If
Neslib
SHA
SHA-1
SHA-224
SHA-256
SHA-384
SHA-512
Secure Hash
Algorithm
assignment
pointless
because
algorithm has
no key
FIPS PUB 180-1
FIPS PUB 180-2
ISO/IEC 10118-
3:1998
Table 8. FCS_COP.1 iterations (cryptographic operations) (continued)
Restrict Iteration label
[assignment: list of
cryptographic operations]
[assignment:
cryptographic
algorithm]
[assignment:
cryptographic
key sizes]
[assignment: list of
standards]
Table 9. FCS_CKM.1 iterations (cryptographic key generation)
Iteration label
[assignment: cryptographic
key generation algorithm]
[assignment:
cryptographic
key sizes]
[assignment: list of
standards]
Prime generation
prime generation and RSA
prime generation algorithm
up to 2048 bits
FIPS PUB 140-2
FIPS PUB 186
Protected prime
generation
prime generation and RSA
prime generation algorithm,
protected against side channel
attacks
up to 2048 bits
FIPS PUB 140-2
FIPS PUB 186
RSA key generation
RSA key pair generation
algorithm
up to 4096 bits
FIPS PUB 140-2
ISO/IEC 9796-2
PKCS #1 V2.1
Protected RSA key
generation
RSA key pair generation
algorithm, protected against
side channel attacks
up to 4096 bits
FIPS PUB 140-2
ISO/IEC 9796-2
PKCS #1 V2.1
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137 The TSF shall allow none to specify alternative initial values to override the default values
when an object or information is created.
Application note:
The security attributes are the set of access rights currently defined. They are dynamically
attached to the subjects and objects locations, i.e. each logical address.
7.1.14 Management of security attributes (MSA.1)
138 The TSF shall enforce the Dynamic Memory Access Control Policy to restrict the ability
to modify the current set of access rights security attributes to software running in
supervisor level.
7.1.15 Complete access control (FDP_ACC.2)
139 The TSF shall enforce the Dynamic Memory Access Control Policy on all subjects
(software), all objects (data including code stored in memories) and all operations
among subjects and objects covered by the SFP.
140 The TSF shall ensure that all operations between any subject controlled by the TSF and any
object controlled by the TSF are covered by an access control SFP.
7.1.16 Security attribute based access control (FDP_ACF.1)
141 The TSF shall enforce the Dynamic Memory Access Control Policy to objects based on
the software clearance level, the object location, the operation to be performed, and
the current set of access rights.
142 The TSF shall enforce the following rules to determine if an operation among controlled
subjects and controlled objects is allowed: the operation is allowed if and only if the
software clearance level, the object location and the operation matches an entry in
the current set of access rights.
143 The TSF shall explicitly authorise access of subjects to objects based on the following
additional rules: none.
144 The TSF shall explicitly deny access of subjects to objects based on the following additional
rules: none.
Note: It should be noted that this level of policy detail is not needed at the application level. The
composite Security Target writer should describe the ES access control and information flow
control policies instead. Within the ES High Level Design description, the chosen setting of
IC security attributes would be shown to implement the described policies relying on the IC
SFP presented here.
145 The following SFP Dynamic Memory Access Control Policy is defined for the requirement
"Security attribute based access control (FDP_ACF.1)":
146 SFP_3: Dynamic Memory Access Control Policy
147 The TSF must control read, write, execute accesses of software to data (including code
stored in memory areas), based on their respective clearance levels and on the current set
of access rights.
a. See the Datasheet referenced in Section 9 for actual values.
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7.1.17 Specification of management functions (FMT_SMF.1)
148 The TSF will be able to perform the following management functions: modification of the
current set of access rights security attributes by software running in supervisor
level, supporting the Dynamic Memory Access Control Policy.
7.2 TOE security assurance requirements
149 Security Assurance Requirements for the TOE for the evaluation of the TOE are those taken
from the Evaluation Assurance Level 5 (EAL5) and augmented by taking the following
components:
● ALC_DVS.2 and AVA_VAN.5.
150 Regarding application note 21 of BSI-PP-0035, the continuously increasing maturity level of
evaluations of Security ICs justifies the selection of a higher-level assurance package.
151 The set of security assurance requirements (SARs) is presented in Table 10, indicating the
origin of the requirement.
Table 10. TOE security assurance requirements
Label Title Origin
ADV_ARC.1 Security architecture description EAL5/BSI-PP-0035
ADV_FSP.5
Complete semi-formal functional specification with
additional error information
EAL5
ADV_IMP.1 Implementation representation of the TSF EAL5/BSI-PP-0035
ADV_INT.2 Well-stuctured internals EAL5
ADV_TDS.4 Semiformal modular design EAL5
AGD_OPE.1 Operational user guidance EAL5/BSI-PP-0035
AGD_PRE.1 Preparative procedures EAL5/BSI-PP-0035
ALC_CMC.4
Production support, acceptance procedures and
automation
EAL5/BSI-PP-0035
ALC_CMS.5 Development tools CM coverage EAL5
ALC_DEL.1 Delivery procedures EAL5/BSI-PP-0035
ALC_DVS.2 Sufficiency of security measures BSI-PP-0035
ALC_LCD.1 Developer defined life-cycle model EAL5/BSI-PP-0035
ALC_TAT.2 Compliance with implementation standards EAL5
ATE_COV.2 Analysis of coverage EAL5/BSI-PP-0035
ATE_DPT.3 Testing: modular design EAL5
ATE_FUN.1 Functional testing EAL5/BSI-PP-0035
ATE_IND.2 Independent testing - sample EAL5/BSI-PP-0035
AVA_VAN.5 Advanced methodical vulnerability analysis BSI-PP-0035
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7.3 Refinement of the security assurance requirements
152 As BSI-PP-0035 defines refinements for selected SARs, these refinements are also claimed
in this Security Target.
153 The main customizing is that the IC Dedicated Software is an operational part of the TOE
after delivery, although it is not available to the user.
154 Regarding application note 22 of BSI-PP-0035, the refinements for all the assurance
families have been reviewed for the hierarchically higher-level assurance components
selected in this Security Target.
155 The text of the impacted refinements of BSI-PP-0035 is reproduced in the next sections.
156 For reader’s ease, an impact summary is provided in Table 11.
7.3.1 Refinement regarding functional specification (ADV_FSP)
157 Although the IC Dedicated Test Software is a part of the TOE, the test functions of the IC
Dedicated Test Software are not described in the Functional Specification because the IC
Dedicated Test Software is considered as a test tool delivered with the TOE but not
providing security functions for the operational phase of the TOE. The IC Dedicated
Software provides security functionalities as soon as the TOE becomes operational
(boot software). These are properly identified in the delivered documentation.
158 The Functional Specification refers to datasheet to trace security features that do not
provide any external interface but that contribute to fulfil the SFRs e.g. like physical
protection. Thereby they are part of the complete instantiation of the SFRs.
159 The Functional Specification refers to design specifications to detail the mechanisms
against physical attacks described in a more general way only, but detailed enough to be
able to support Test Coverage Analysis also for those mechanisms where inspection of the
layout is of relevance or tests beside the TSFI may be needed.
Table 11. Impact of EAL5 selection on BSI-PP-0035 refinements
Assurance
Family
BSI-PP-0035
Level
ST
Level
Impact on refinement
ADO_DEL 1 1 None
ALC_DVS 2 2 None
ALC_CMS 4 5 None, refinement is still valid
ALC_CMC 4 4 None
ADV_ARC 1 1 None
ADV_FSP 4 5
Presentation style changes, IC Dedicated Software is
included
ADV_IMP 1 1 None
ATE_COV 2 2 IC Dedicated Software is included
AGD_OPE 1 1 None
AGD_PRE 1 1 None
AVA_VAN 5 5 None
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160 The Functional Specification refers to data sheet to specify operating conditions of the
TOE. These conditions include but are not limited to the frequency of the clock, the power
supply, and the temperature.
161 All functions and mechanisms which control access to the functions provided by the IC
Dedicated Test Software (refer to the security functional requirement (FMT_LIM.2)) are part
of the Functional Specification. Details will be given in the document for ADV_ARC, refer to
Section 6.2.1.5. In addition, all these functions and mechanisms are subsequently be
refined according to all relevant requirements of the Common Criteria assurance class ADV
because these functions and mechanisms are active after TOE Delivery and need to be part
of the assurance aspects Tests (class ATE) and Vulnerability Assessment (class AVA).
Therefore, all necessary information is provided to allow tests and vulnerability assessment.
162 Since the selected higher-level assurance component requires a security functional
specification presented in a “semi-formal style" (ADV_FSP.5.2C) the changes affect the style
of description, the BSI-PP-0035 refinements can be applied with changes covering the IC
Dedicated Test Software and are valid for ADV_FSP.5.
7.3.2 Refinement regarding test coverage (ATE_COV)
163 The TOE is tested under different operating conditions within the specified ranges. These
conditions include but are not limited to the frequency of the clock, the power supply, and the
temperature. This means that “Fault tolerance (FRU_FLT.2)” is proven for the complete TSF.
The tests must also cover functions which may be affected by “ageing” (such as EEPROM
writing).
164 The existence and effectiveness of measures against physical attacks (as specified by the
functional requirement FPT_PHP.3) cannot be tested in a straightforward way. Instead
STMicroelectronics provides evidence that the TOE actually has the particular physical
characteristics (especially layout design principles). This is done by checking the layout
(implementation or actual) in an appropriate way. The required evidence pertains to the
existence of mechanisms against physical attacks (unless being obvious).
165 The IC Dedicated Test Software is seen as a “test tool” being delivered as part of the TOE.
However, the Test Features do not provide security functionality. Therefore, Test Features
need not to be covered by the Test Coverage Analysis but all functions and mechanisms
which limit the capability of the functions (cf. FMT_LIM.1) and control access to the
functions (cf. FMT_LIM.2) provided by the IC Dedicated Test Software must be part of the
Test Coverage Analysis. The IC Dedicated Software provides security functionalities as
soon as the TOE becomes operational (boot software). These are part of the Test
Coverage Analysis.
7.4 Security Requirements rationale
7.4.1 Rationale for the Security Functional Requirements
166 Just as for the security objectives rationale of Section 6.3, the main line of this rationale is
that the inclusion of all the security requirements of the BSI-PP-0035 protection profile,
together with those in AUG, guarantees that all the security objectives identified in Section 6
are suitably addressed by the security requirements stated in this chapter, and that the latter
together form an internally consistent whole.
167 As origins of security objectives have been carefully kept in their labelling, and origins of
security requirements have been carefully identified in Table 7 and Table 10, it can be
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verified that the justifications provided by the BSI-PP-0035 protection profile and AUG can
just be carried forward to their union.
168 From Table 5, it is straightforward to identify two additional security objectives for the TOE
(AUG1.O.Add-Functions and AUG4.O.Mem Access), all tracing back to AUG. This rationale
must show that security requirements suitably address these too.
169 Furthermore, a more careful observation of the requirements listed in Table 7 and Table 10
shows that:
● there are additional security requirements introduced by this Security Target
(FCS_CKM.1 (if Neslib is embedded only) and various assurance requirements of
EAL5),
● there are security requirements introduced from AUG (FCS_COP.1, FDP_ACC.2,
FDP_ACF.1, FMT_MSA.3, FMT_MSA.1 and FMT_SMF.1).
170 Though it remains to show that:
● security objectives from AUG are addressed by security requirements stated in this
chapter,
● additional security requirements from this Security Target and from AUG are mutually
supportive to the security requirements from the BSI-PP-0035 protection profile, and
they do not introduce internal contradictions,
● all dependencies are still satisfied.
171 The justification that the additional security objective is suitably addressed, that the
additional security requirements are mutually supportive and that, together with those
already in BSI-PP-0035, they form an internally consistent whole, is provided in the next
subsections.
7.4.2 Additional security objectives are suitably addressed
Security objective “Dynamic Area based Memory Access Control
(AUG4.O.Mem Access)”
172 The justification related to the security objective “Dynamic Area based Memory Access
Control (AUG4.O.Mem Access)” is as follows:
173 The security functional requirements "Complete access control (FDP_ACC.2)" and
"Security attribute based access control (FDP_ACF.1)", with the related Security Function
Policy (SFP) “Dynamic Memory Access Control Policy” exactly require to implement a
Dynamic area based memory access control as demanded by AUG4.O.Mem Access.
Therefore, FDP_ACC.2 and FDP_ACF.1 with their SFP are suitable to meet the security
objective.
174 The security functional requirement "Static attribute initialisation (FMT_MSA.3)" requires
that the TOE provides default values for security attributes. The ability to update the security
attributes is restricted to privileged subject(s) as further detailed in the security
functional requirements "Management of security attributes (MSA.1)". These
management functions together with "Specification of management functions
(FMT_SMF.1)" ensure that the required access control can be realised using the functions
provided by the TOE.
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Security objective “Additional Specific Security Functionality (AUG1.O.Add-
Functions)”
175 The justification related to the security objective “Additional Specific Security Functionality
(AUG1.O.Add-Functions)” is as follows:
176 The security functional requirements “Cryptographic operation (FCS_COP.1)” and
"Cryptographic key generation (FCS_CKM.1)" exactly require those functions to be
implemented that are demanded by AUG1.O.Add-Functions. Therefore, FCS_COP.1 is
suitable to meet the security objective, together with FCS_CKM.1 (if Neslib is embedded
only).
7.4.3 Additional security requirements are consistent
"Cryptographic operation (FCS_COP.1) & key generation (FCS_CKM.1 (if
Neslib is embedded only))"
177 These security requirements have already been argued in Section : Security objective
“Dynamic Area based Memory Access Control (AUG4.O.Mem Access)” above.
"Static attribute initialisation (FMT_MSA.3),
Management of security attributes (FMT_MSA.1),
Complete access control (FDP_ACC.2),
Security attribute based access control (FDP_ACF.1),
Specification of management functions (FMT_SMF.1)"
178 These security requirements have already been argued in Section : Security objective
“Dynamic Area based Memory Access Control (AUG4.O.Mem Access)” above.
7.4.4 Dependencies of Security Functional Requirements
179 All dependencies of Security Functional Requirements have been fulfilled in this Security
Target except :
● those justified in the BSI-PP-0035 protection profile security requirements rationale,
● those justifed in AUG security requirements rationale (except on FMT_MSA.2, see
discussion below),
● the dependency of FCS_COP.1 and FCS_CKM.1 (if Neslib is embedded only) on
FCS_CKM.4 (see discussion below).
180 Details are provided in Table 12 below.
Table 12. Dependencies of security functional requirements
Label Dependencies
Fulfilled by security
requirements in this
Security Target
Dependency already
in BSI-PP-0035 or
in AUG
FRU_FLT.2 FPT_FLS.1 Yes Yes, BSI-PP-0035
FPT_FLS.1 None No dependency Yes, BSI-PP-0035
FMT_LIM.1 FMT_LIM.2 Yes Yes, BSI-PP-0035
FMT_LIM.2 FMT_LIM.1 Yes Yes, BSI-PP-0035
FAU_SAS.1 None No dependency Yes, BSI-PP-0035
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181 Part 2 of the Common Criteria defines the dependency of "Cryptographic operation
(FCS_COP.1)" on "Import of user data without security attributes (FDP_ITC.1)" or "Import of
user data with security attributes (FDP_ITC.2)" or "Cryptographic key generation
(FCS_CKM.1)". In this particular TOE, “Cryptographic key generation (FCS_CKM.1)" may
be used for the purpose of creating cryptographic keys, but also the ES has all possibilities
to implement its own creation function, in conformance with its security policy.
182 Part 2 of the Common Criteria defines the dependency of "Cryptographic operation
(FCS_COP.1)" and “Cryptographic key generation (FCS_CKM.1)" on "Cryptographic key
destruction (FCS_CKM.4)". In this particular TOE, there is no specific function for the
destruction of the keys. The ES has all possibilities to implement its own destruction
function, in conformance with its security policy. This is why FCS_CKM.4 is not defined in
this ST.
FPT_PHP.3 None No dependency Yes, BSI-PP-0035
FDP_ITT.1
FDP_ACC.1 or
FDP_IFC.1
Yes Yes, BSI-PP-0035
FPT_ITT.1 None No dependency Yes, BSI-PP-0035
FDP_IFC.1 FDP_IFF.1 No, see BSI-PP-0035 Yes, BSI-PP-0035
FCS_RNG.1 None No dependency Yes, BSI-PP-0035
FCS_COP.1
[FDP_ITC.1 or
FDP_ITC.2 or
FCS_CKM.1]
Yes, by FCS_CKM.1, see
discussion below Yes, AUG #1
FCS_CKM.4 No, see discussion below
FCS_CKM.1
[FDP_CKM.2 or
FCS_COP.1]
Yes, by FCS_COP.1
No, CCMB-2009-07-002
FCS_CKM.4 No, see discussion below
FDP_ACC.2 FDP_ACF.1 Yes No, CCMB-2009-07-002
FDP_ACF.1
FDP_ACC.1 Yes, by FDP_ACC.2
Yes, AUG #4
FMT_MSA.3 Yes
FMT_MSA.3
FMT_MSA.1 Yes
Yes, AUG #4
FMT_SMR.1 No, see AUG #4
FMT_MSA.1
[FDP_ACC.1 or
FDP_IFC.1]
Yes, by FDP_ACC.2 Yes, AUG #4
FMT_SMF.1 Yes No, CCMB-2009-07-002
FMT_SMR.1 No, see AUG #4 Yes, AUG #4
FMT_SMF.1 None No dependency No, CCMB-2009-07-002
Table 12. Dependencies of security functional requirements (continued)
Label Dependencies
Fulfilled by security
requirements in this
Security Target
Dependency already
in BSI-PP-0035 or
in AUG
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7.4.5 Rationale for the Assurance Requirements
Security assurance requirements added to reach EAL5 (Table 10)
183 Regarding application note 21 of BSI-PP-0035, this Security Target chooses EAL5 because
developers and users require a high level of independently assured security in a planned
development and require a rigorous development approach without incurring unreasonable
costs attributable to specialist security engineering techniques.
184 EAL5 represents a meaningful increase in assurance from EAL4 by requiring semiformal
design descriptions, a more structured (and hence analyzable) architecture, and improved
mechanisms and/or procedures that provide confidence that the TOE will not be tampered
during development.
185 The assurance components in an evaluation assurance level (EAL) are chosen in a way that
they build a mutually supportive and complete set of components. The requirements chosen
for augmentation do not add any dependencies, which are not already fulfilled for the
corresponding requirements contained in EAL5. Therefore, these components add
additional assurance to EAL5, but the mutual support of the requirements and the internal
consistency is still guaranteed.
186 Note that detailed and updated refinements for assurance requirements are given in
Section 7.3.
Dependencies of assurance requirements
187 Dependencies of security assurance requirements are fulfilled by the EAL5 package
selection.
188 Augmentation to this package are identified in paragraph 149 and do not introduce
dependencies not already satisfied by the EAL5 package.
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8 TOE summary specification
189 This section describes how the TOE meets each Security Functional Requirement, which
will be further detailed in ADV_FSP documents.
190 The complete TOE summary specification has been presented in the SC23Z018A and 7
derivative products with optional cryptographic library NESLIB 3.1 Security Target.
191 For confidentiality reasons, the TOE summary specification is not fully reproduced here.
8.1 Limited fault tolerance (FRU_FLT.2)
192 The TSF provides limited fault tolerance, by managing a certain number of faults or errors
that may happen, related to memory contents, random number generation and
cryptographic operations, thus preventing risk of malfunction.
8.2 Failure with preservation of secure state (FPT_FLS.1)
193 The TSF provides preservation of secure state by managing the following events, resulting
in an immediate reset:
● Die integrity violation detection,
● Errors on memories,
● Bus integrity error,
● Glitches,
● High voltage supply,
● CPU error,
● Clock tree error,
● etc..
194 The ES can generate a software reset.
8.3 Limited capabilities (FMT_LIM.1)
195 The TSF ensures that only very limited test capabilities are available in USER configuration,
in accordance with SFP_1: Limited capability and availability Policy.
8.4 Limited availability (FMT_LIM.2)
196 The TOE is either in TEST or in USER configuration.
197 The only authorised TOE configuration modification is:
● TEST to USER configuration.
198 The TSF ensures the switching and the control of TOE configuration and mode.
199 The TSF reduces the available features depending on the TOE configuration.
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8.5 Audit storage (FAU_SAS.1)
200 The TOE provides commands to store data and/or pre-personalisation data and/or
supplements of the ES in the NVM. These commands are only available to authorised
processes, and only until end of phase 4.
8.6 Resistance to physical attack (FPT_PHP.3)
201 The TSF ensures resistance to physical tampering, thanks to the following features:
● The TOE implements counter-measures that reduce the exploitability of physical
probing.
● The TOE is physically protected by an active shield that commands an automatic
reaction on die integrity violation detection.
8.7 Basic internal transfer protection (FDP_ITT.1), Basic internal
TSF data transfer protection (FPT_ITT.1) & Subset
information flow control (FDP_IFC.1)
202 The TSF prevents the disclosure of internal and user data thanks to the following features:
203 The TSF prevents the disclosure of internal and user data thanks to:
● Memories scrambling and encryption,
● Bus encryption,
● Mechanisms for operation execution concealment,
● etc..
8.8 Random number generation (FCS_RNG.1)
204 The TSF provides 8-bit true random numbers that can be qualified with the test metrics
required by the BSI-AIS31 standard for a P2 class device.
8.9 Cryptographic operation: DES / 3DES operation (FCS_COP.1
[EDES])
205 The TOE provides an EDES+ accelerator that has the capability to perform the following
standard DES cryptographic operations, conformant to FIPS PUB 46-3, with intrinsic
counter-measures against fault attacks (FA), DEMA and DPA attacks:
● DES encryption,
● DES decryption,
● Triple DES encryption,
● Triple DES decryption.
206 The EDES+ accelerator offers a Cipher Block Chaining (CBC) mode conformant to ISO/IEC
10116.
Sx23Zxxx Security Target - Public Version TOE summary specification
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8.10 Cryptographic operation: RSA operation (FCS_COP.1 [RSA])
if Neslib only
207 The cryptographic library Neslib provides the RSA public key cryptographic operation for
modulus sizes up to 4096 bits, conformant to PKCS #1 V2.1.
208 The cryptographic library Neslib provides the RSA private key cryptographic operation with
or without CRT for modulus sizes up to 4096 bits, conformant to PKCS #1 V2.1.
8.11 Cryptographic operation: AES operation (FCS_COP.1 [AES])
if Neslib only
209 The cryptographic library Neslib provides an AES the following standard AES cryptographic
operations for key sizes of 128, 192 and 256 bits, conformant to FIPS PUB 197 with intrinsic
counter-measures against attacks:
● randomize,
● key expansion,
● cipher,
● inverse cipher.
8.12 Cryptographic operation: Elliptic Curves Cryptography
operation (FCS_COP.1 [ECC]) if Neslib only
210 The cryptographic library Neslib provides to the ES developer the following efficient basic
functions for Elliptic Curves Cryptography over prime fields, all conformant to IEEE 1363-
2000 and IEEE 1363a-2004:
● private scalar multiplication,
● preparation of Elliptic Curve computations in affine coordinates,
● public scalar multiplication,
● point validity check,
● Jacobian conversion to affine coordinates,
● general point addition,
● point expansion and compression.
8.13 Cryptographic operation: SHA operation (FCS_COP.1 [SHA])
if Neslib only
211 The cryptographic library Neslib provides the SHA-1, SHA-224, SHA-256, SHA-384, SHA-
512 secure hash functions conformant to FIPS PUB 180-1, FIPS PUB 180-2, ISO/IEC
10118-3:1998.
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8.14 Cryptographic key generation: Prime generation
(FCS_CKM.1 [Prime_generation]) if Neslib only
212 The cryptographic library Neslib provides prime numbers generation for key sizes up to
2048 bits conformant to FIPS PUB 140-2 and FIPS PUB 186.
8.15 Cryptographic key generation: Protected Prime generation
(FCS_CKM.1 [PROTECTED_Prime_generation]) if Neslib only
213 The cryptographic library Neslib provides prime numbers generation for key sizes up to
2048 bits conformant to FIPS PUB 140-2 and FIPS PUB 186, and offering resistance
against side channel and fault attacks.
8.16 Cryptographic key generation: RSA key generation
(FCS_CKM.1 [RSA_Key_generation]) if Neslib only
214 The cryptographic library Neslib provides standard RSA public and private key computation
for key sizes upto 4096 bits conformant to FIPS PUB 140-2, ISO/IEC 9796-2 and PKCS #1
V2.1.
8.17 Cryptographic key generation: PROTECTED RSA key
generation (FCS_CKM.1
[PROTECTED_RSA_Key_generation]) if Neslib only
215 The cryptographic library Neslib provides standard RSA public and private key computation
for key sizes upto 4096 bits conformant to FIPS PUB 140-2, ISO/IEC 9796-2 and PKCS #1
V2.1, and offering resistance against side channel and fault attacks.
8.18 Static attribute initialisation (FMT_MSA.3)
216 The TOE enforces a default memory protection policy when none other is programmed by
the ES.
8.19 Management of security attributes (FMT_MSA.1) &
Specification of management functions (FMT_SMF.1)
217 The TOE provides a dynamic Memory Protection Unit (MPU), that can be configured by the
ES.
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8.20 Complete access control (FDP_ACC.2) & Security attribute
based access control (FDP_ACF.1)
218 The TOE enforces the dynamic memory protection policy for data access and code access
thanks to a dynamic Memory Protection Unit (MPU), programmed by the ES. Overriding the
MPU set of access rights, the TOE enforces:
● an additional protection of the NVM sectors against modification (write and erase),
programmed by the ES,
● a permanent protection of the OST ROM and, in User configuration, a protection of the
ST NVM against write accesses.
References Sx23Zxxx Security Target - Public Version
46/55 SMD_SC23Z018_ST_13_001
9 References
219 Protection Profile reference
220 Security Target references
221 Guidance documentation references
222 Standards references
Component description Reference Revision
Security IC Platform Protection Profile BSI-PP-0035 1.0
Component description Reference
SC23Z018A and 7 derivative products with optional
cryptographic library NESLIB 3.1 Security Target
SMD_SC23Z018_ST_12_001
Component description Reference Revision
SC23Z018: Smartcard MCU with enhanced
security, crypto-processor, 18 KByte EEPROM -
Datasheet
DS_23Z018 0.4
SB23Z012/SC23Z018 and derivative devices -
Security guidance
AN_SECU_Sx23Z0xx 1
ST23 AIS31 compliant random number user
manual
UM_23_AIS31 2
ST23 AIS31 Reference implementation - Startup,
online and total failure tests - User manual
AN_23_AIS31 2
ST21/23 programming manual PM_21_23 3
ST23 NesLib 3.1 cryptographic library user
manual
UM_23_NESLIB_3.1 5
How to identify certified HW devices using
additional ST traceability information
AN_TRACE 2
Application Note - Recommendations for use of
EEPROM in SC23Z018, SB23Z012 and derivative
devices
AN_Sx23Z01x_EEPROM 1
Ref Identifier Description
[1] BSI-AIS31
A proposal for Functionality classes and evaluation methodology for
true (physical) random number generators,
W. Killmann & W. Schindler
BSI, Version 3.1, 25-09-2001
[2] FIPS PUB 46-3
FIPS PUB 46-3, Data encryption standard (DES), National Institute of
Standards and Technology, U.S. Department of Commerce, 1999
Sx23Zxxx Security Target - Public Version References
SMD_SC23Z018_ST_13_001 47/55
[3] FIPS PUB 140-2
FIPS PUB 140-2, Security Requirements for Cryptographic Modules,
National Institute of Standards and Technology, U.S. Department of
Commerce, 1999
[4] FIPS PUB 180-1
FIPS PUB 180-1 Secure Hash Standard, National Institute of
Standards and Technology, U.S. Department of Commerce, 1995
[5] FIPS PUB 180-2
FIPS PUB 180-2 Secure Hash Standard with Change Notice 1 dated
February 25,2004, National Institute of Standards and Technology,
U.S.A., 2004
[6] FIPS PUB 186
FIPS PUB 186 Digital Signature Standard (DSS), National Institute of
Standards and Technology, U.S.A., 1994
[7] FIPS PUB 197
FIPS PUB 197, Advanced Encryption Standard (AES), National
Institute of Standards and Technology, U.S. Department of Commerce,
November 2001
[8] ISO/IEC 9796-2
ISO/IEC 9796, Information technology - Security techniques - Digital
signature scheme giving message recovery - Part 2: Integer
factorization based mechanisms, ISO, 2002
[9] ISO/IEC 9797-1
ISO/IEC 9797, Information technology - Security techniques -
Message Authentication Codes (MACs) - Part 1: Mechanisms using a
block cipher, ISO, 1999
[10] ISO/IEC 10116
ISO/IEC 10116, Information technology - Security techniques - Modes
of operation of an n-bit block cipher algorithm, ISO, 1997
[11]
ISO/IEC 10118-
3:1998
Information technology - Security techniques - Hash functions - Part 3:
Dedicated hash functions
[12] ISO/IEC 14888
ISO/IEC 14888, Information technology - Security techniques - Digital
signatures with appendix - Part 1: General (1998), Part 2: Identity-
based mechanisms (1999), Part 3: Certificate based mechanisms
(2006), ISO
[13] CCMB-2009-07-001
Common Criteria for Information Technology Security Evaluation - Part
1: Introduction and general model, July 2009, version 3.1 Revision 3
[14] CCMB-2009-07-002
Common Criteria for Information Technology Security Evaluation - Part
2: Security functional components, July 2009, version 3.1 Revision 3
[15] CCMB-2009-07-003
Common Criteria for Information Technology Security Evaluation - Part
3: Security assurance components, July 2009, version 3.1 Revision 3
[16] AUG
Smartcard Integrated Circuit Platform Augmentations,
Atmel, Hitachi Europe, Infineon Technologies, Philips Semiconductors,
Version 1.0, March 2002.
[17] MIT/LCS/TR-212
On digital signatures and public key cryptosystems,
Rivest, Shamir & Adleman
Technical report MIT/LCS/TR-212, MIT Laboratory for computer
sciences, January 1979
[18] IEEE 1363-2000
IEEE 1363-2000, Standard Specifications for Public Key Cryptography,
IEEE, 2000
[19] IEEE 1363a-2004
IEEE 1363a-2004, Standard Specifications for Public Key
Cryptography - Amendment 1:Additional techniques, IEEE, 2004
Ref Identifier Description
References Sx23Zxxx Security Target - Public Version
48/55 SMD_SC23Z018_ST_13_001
[20] PKCS #1 V2.1
PKCS #1 V2.1 RSA Cryptography Standard, RSA Laboratories, June
2002
[21] MOV 97
Alfred J. Menezes, Paul C. van Oorschot and Scott A. Vanstone,
Handbook of Applied Cryptography, CRC Press, 1997
[22] NOTE 12.1
Note d’application: Modélisation formelle des politiques de sécurité
d’une cible d’évaluation
NOTE/12.1, N°587/SGDN/DCSSI/SDR
DCSSI, 25-03-2008
Ref Identifier Description
Sx23Zxxx Security Target - Public Version Glossary
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Appendix A Glossary
A.1 Terms
Authorised user
A user who may, in accordance with the TSP, perform an operation.
Composite product
Security IC product which includes the Security Integrated Circuit (i.e. the TOE) and the
Embedded Software and is evaluated as composite target of evaluation.
Differential Power Analysis (DPA)
An analysis in variations of the electrical power consumption of a device, using
advanced statistical methods and/or error correction techniques, for the purpose of
extracting information correlated to secrets processed in the device. When several
consumption traces are recombined during analysis to remove counter-measures
adding random, the analysis is known as Higher Order DPA (HODPA).
Dual mode
Contact and contactless I/O modes.
End-consumer
User of the Composite Product in Phase 7.
Integrated Circuit (IC)
Electronic component(s) designed to perform processing and/or memory functions.
IC Dedicated Software
IC proprietary software embedded in a Security IC (also known as IC firmware) and
developed by ST. Such software is required for testing purpose (IC Dedicated Test
Software) but may provide additional services to facilitate usage of the hardware and/or
to provide additional services (IC Dedicated Support Software).
IC Dedicated Test Software
That part of the IC Dedicated Software which is used to test the TOE before TOE
Delivery but which does not provide any functionality thereafter.
IC developer
Institution (or its agent) responsible for the IC development.
IC manufacturer
Institution (or its agent) responsible for the IC manufacturing, testing, and pre-
personalization.
IC packaging manufacturer
Institution (or its agent) responsible for the IC packaging and testing.
Initialisation data
Initialisation Data defined by the TOE Manufacturer to identify the TOE and to keep
track of the Security IC’s production and further life-cycle phases are considered as
belonging to the TSF data. These data are for instance used for traceability and for
TOE identification (identification data)
Object
An entity within the TSC that contains or receives information and upon which subjects
perform operations.
Glossary Sx23Zxxx Security Target - Public Version
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Packaged IC
Security IC embedded in a physical package such as micromodules, DIPs, SOICs or
TQFPs.
Pre-personalization data
Any data supplied by the Card Manufacturer that is injected into the non-volatile
memory by the Integrated Circuits manufacturer (Phase 3). These data are for instance
used for traceability and/or to secure shipment between phases.
Secret
Information that must be known only to authorised users and/or the TSF in order to
enforce a specific SFP.
Security IC
Composition of the TOE, the Security IC Embedded Software, User Data, and the
package.
Security IC Embedded SoftWare (ES)
Software embedded in the Security IC and not developed by the IC designer. The
Security IC Embedded Software is designed in Phase 1 and embedded into the
Security IC in Phase 3.
Security IC embedded software (ES) developer
Institution (or its agent) responsible for the security IC embedded software
development and the specification of IC pre-personalization requirements, if any.
Security attribute
Information associated with subjects, users and/or objects that is used for the
enforcement of the TSP.
Sensitive information
Any information identified as a security relevant element of the TOE such as:
– the application data of the TOE (such as IC pre-personalization requirements, IC
and system specific data),
– the security IC embedded software,
– the IC dedicated software,
– the IC specification, design, development tools and technology.
Secure Microcontroller
A card according to ISO 7816 requirements which has a non volatile memory and a
processing unit embedded within it.
Simple Power Analysis (SPA)
A direct analysis, primarily visual, of patterns of instruction execution (or execution of
individual instructions), obtained through monitoring the variations in electrical power
consumption of a device, for the purpose of revealing the features and implementations
of (cryptographic) algorithms and subsequently the values of the secrets they process
in the device.
Subject
An entity within the TSC that causes operations to be performed.
Test features
All features and functions (implemented by the IC Dedicated Software and/or
hardware) which are designed to be used before TOE Delivery only and delivered as
part of the TOE.
Sx23Zxxx Security Target - Public Version Glossary
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TOE Delivery
The period when the TOE is delivered which is either (i) after Phase 3 (or before Phase
4) if the TOE is delivered in form of wafers or sawn wafers (dice) or (ii) after Phase 4 (or
before Phase 5) if the TOE is delivered in form of packaged products.
TSF data
Data created by and for the TOE, that might affect the operation of the TOE.
User
Any entity (human user or external IT entity) outside the TOE that interacts with the
TOE.
User data
All data managed by the Smartcard Embedded Software in the application context.
User data comprise all data in the final Smartcard IC except the TSF data.
Warm reset
Reset operation on the TOE without lowering power under the Power on Reset (POR)
level.
A.2 Abbreviations
USR_ROM
Table 13. List of abbreviations
Term Meaning
AIS Application notes and Interpretation of the Scheme (BSI)
ALU Arithmetical and Logical Unit.
API Application Programming Interface.
BSI Bundesamt für Sicherheit in der Informationstechnik.
CBC Cipher Block Chaining.
CC Common Criteria Version 3.1.
CPU Central Processing Unit.
CRC Cyclic Redundancy Check.
DCSSI Direction Centrale de la Securite des Systemes d’Information.
DEMA Differential Electromagnetic Analysis.
DES Data Encryption Standard.
DIP Dual-In-Line Package.
DPA Differential Power Analysis.
DSW IC Proprietary Dedicated Software.
EAL Evaluation Assurance Level.
ECB Electronic Code Book.
ECC Elliptic Curves Cryptography or Error Correcting Code.
EDES Enhanced DES.
EEPROM Electrically Erasable Programmable Read Only Memory.
Glossary Sx23Zxxx Security Target - Public Version
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EMA Electromagnetic Analysis.
ES Security IC Embedded Software.
FIPS Federal Information Processing Standard.
HODPA High Order Differential Power Analysis.
I2C Inter-integrated circuit.
I/O Input / Output.
IART ISO-7816 Asynchronous Receiver Transmitter.
IC Integrated Circuit.
ISO International Standards Organisation.
IT Information Technology.
MPU Memory Protection Unit.
NESCRYPT Next Step Cryptography Accelerator.
NIST National Institute of Standards and Technology.
NVM Non Volatile Memory.
OSP Organisational Security Policy.
OST Operating System for Test.
OTP One Time Programmable.
POR Power On Reset.
PP Protection Profile.
PUB Publication Series.
RAM Random Access Memory.
ROM Read Only Memory.
RSA Rivest, Shamir & Adleman.
SAR Security Assurance Requirement.
SFP Security Function Policy.
SFR Security Functional Requirement.
SMD Secure Microcontrollers Division.
SOIC Small Outline IC.
ST Context dependent : STMicroelectronics or Security Target.
ST-ROM ST reserved ROM.
TOE Target of Evaluation.
TQFP Thin Quad Flat Package.
TRNG True Random Number Generator.
TSC TSF Scope of Control.
TSF TOE Security Functionality.
Table 13. List of abbreviations (continued)
Term Meaning
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TSFI TSF Interface.
TSP TOE Security Policy.
USR_ROM User reserved ROM.
Table 13. List of abbreviations (continued)
Term Meaning
Revision history Sx23Zxxx Security Target - Public Version
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10 Revision history
Table 14. Document revision history
Date Revision Changes
08-Jan-2013 01.00 Initial release.
18-Feb-2013 01.01 Reference documents updated.
26-Feb-2013 01.02 Reference documents updated.
02-Apr-2013 01.03 Reference documents updated.
03-Sep-2013 01.04 Reference documents updated.
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