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Reference: 2018-19-INF-3292-v1
Target: Público
Date: 04.11.2020
Created by: CERT11
Revised by: CALIDAD
Approved by: TECNICO
CERTIFICATION REPORT
Dossier # 2018-19
TOE Winbond SpiFlash TrustME Secure Flash Memory
W75F32WWJB\W75F32WWJC version A
Applicant 22099218J - Winbond Electronics Corporation
References
[EXT-4055] Certification Request
[EXT-6177] Evaluation Technical Report
Certification report of the product Winbond SpiFlash TrustME Secure Flash Memory
W75F32WWJB\W75F32WWJC version A, as requested in [EXT-4055] dated 05/06/2018, and
evaluated by Applus Laboratories, as detailed in the Evaluation Technical Report [EXT-6177]
received on 15/09/2020.
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CONTENTS
EXECUTIVE SUMMARY...........................................................................................................................3
TOE SUMMARY...................................................................................................................................3
SECURITY ASSURANCE REQUIREMENTS.............................................................................................4
SECURITY FUNCTIONAL REQUIREMENTS...........................................................................................5
IDENTIFICATION.....................................................................................................................................5
SECURITY POLICIES.................................................................................................................................5
ASSUMPTIONS AND OPERATIONAL ENVIRONMENT .........................................................................5
CLARIFICATIONS ON NON-COVERED THREATS..................................................................................6
OPERATIONAL ENVIRONMENT FUNCTIONALITY ...............................................................................6
ARCHITECTURE.......................................................................................................................................6
LOGICAL ARCHITECTURE ....................................................................................................................6
PHYSICAL ARCHITECTURE...................................................................................................................7
DOCUMENTS..........................................................................................................................................8
PENETRATION TESTING..........................................................................................................................9
EVALUATED CONFIGURATION ...............................................................................................................9
EVALUATION RESULTS .........................................................................................................................10
COMMENTS & RECOMMENDATIONS FROM THE EVALUATION TEAM...............................................10
CERTIFIER RECOMMENDATIONS .........................................................................................................10
GLOSSARY.............................................................................................................................................11
BIBLIOGRAPHY .....................................................................................................................................11
SECURITY TARGET / SECURITY TARGET LITE........................................................................................12
RECOGNITION AGREEMENTS...............................................................................................................13
European Recognition of ITSEC/CC – Certificates (SOGIS-MRA)......................................................13
International Recognition of CC – Certificates (CCRA).....................................................................13
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EXECUTIVE SUMMARY
This document constitutes the Certification Report for the certification file of the product Winbond
SpiFlash TrustME Secure Flash Memory W75F32WWJB\W75F32WWJC version A.
The TOE is a Memory Flash IC.
Developer/manufacturer: Winbond Electronics Corporation
Sponsor: Winbond Electronics Corporation.
Certification Body: Centro Criptológico Nacional (CCN).
ITSEF: Applus Laboratories.
Protection Profile: None.
Evaluation Level: Common Criteria v3.1 R5 EAL5 + ALC_DVS.2 + AVA_VAN.5
Evaluation end date: 02/10/2020.
Expiration Date1
: 05/11/2025.
All the assurance components required by the evaluation level EAL5 (augmented with ALC_DVS.2
and AVA_VAN.5) have been assigned a “PASS” verdict. Consequently, the laboratory Applus
Laboratories assigns the “PASS” VERDICT to the whole evaluation due all the evaluator actions are
satisfied for the EAL5 + ALC_DVS.2 + AVA_VAN.5, as defined by the Common Criteria v3.1 R5 and
the CEM v3.1 R5.
Considering the obtained evidences during the instruction of the certification request of the
product Winbond SpiFlash TrustME Secure Flash Memory W75F32WWJB\W75F32WWJC version A,
a positive resolution is proposed.
TOE SUMMARY
The TOE is a Memory Flash IC designed to be embedded into highly critical hardware devices such
as smart card, secure element, USB token, secure micro SD, etc. These devices will embed secure
applications such as financial, telecommunication, identity (e-Government), etc. and they will be
working in a hostile environment. In particular, the TOE main function is the secure storage of the
code and data of critical applications.
The security needs for the TOE consist in:
1
This date refers to the expiration date of the certificate recognition within the scope of the mutual recognition
arrangements signed by this Certification Body.
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- Maintaining the integrity of the content of the memories and the confidentiality of the
content of protected memory areas as required by the critical HW products (e.g. Security IC)
the Memory Flash is built for.
- Providing a secure communication with the Host device that will embed the TOE in a secure
HW product such as Security IC.
SECURITY ASSURANCE REQUIREMENTS
The product was evaluated with all the evidence required to fulfil the evaluation level EAL5 and the
evidences required by the additional components ALC_DVS.2 and AVA_VAN.5, according to
Common Criteria v3.1 R5.
ASSURANCE CLASS ASSURANCE COMPONENT
ASE ASE_CCL.1
ASE_ECD.1
ASE_INT.1
ASE_OBJ.2
ASE_REQ.2
ASE_SPD.1
ASE.TSS.1
ADV ADV_ARC.1
ADV_FSP.5
ADV_IMP.1
ADV_INT.2
ADV_TDS.4
AGD AGD_OPE.1
AGD_PRE.1
ALC ALC_CMC.4
ALC_CMS.5
ALC_DEL.1
ALC_DVS.2
ALC_LCD.1
ALC_TAT.2
ATE ATE_COV.2
ATE_DPT.3
ATE_FUN.1
ATE_IND.2
AVA AVA_VAN.5
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SECURITY FUNCTIONAL REQUIREMENTS
The product security functionality satisfies the following functional requirements, according to the
Common Criteria v3.1 R5.
SECURITY FUNCTIONAL REQUIREMENTS
FDP_IFC.1
FDP_ITT.1
FDP_RIP.1
FDP_SDC.1
FDP_SDI.2
FDP_UCT.1
FDP_UIT.1
FMT_LIM.1
FMT_LIM.2
FPT_FLS.1/Binding keys
FPT_FLS.1/Detectors
FPT_ITT.1
FPT_PHP.3
FPT_TRP.1
FRU_FLT.2
IDENTIFICATION
Product: Winbond SpiFlash TrustME Secure Flash Memory W75F32WWJB\W75F32WWJC version A
Security Target: W75F32WWJB\W75F32WWJC Secure Flash Memory Security Target (version 3.1).
Protection Profile: None.
Evaluation Level: Common Criteria v3.1 R5 EAL5 + ALC_DVS.2 + AVA_VAN.5.
SECURITY POLICIES
The use of the product Winbond SpiFlash TrustME Secure Flash Memory
W75F32WWJB\W75F32WWJC version A shall implement a set of security policies assuring the
fulfilment of different standards and security demands.
The detail of these policies is documented in [ST], chapter 3.4 (Organisational Security Policies).
ASSUMPTIONS AND OPERATIONAL ENVIRONMENT
The assumptions detailed in [ST], chapter 3.5 (Assumptions) are constraints to the conditions used
to assure the security properties and functionalities compiled by the security target. These
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assumptions have been applied during the evaluation in order to determine if the identified
vulnerabilities can be exploited.
In order to assure the secure use of the TOE, it is necessary to start from these assumptions for its
operational environment. If this is not possible and any of them could not be assumed, it would not
be possible to assure the secure operation of the TOE.
CLARIFICATIONS ON NON-COVERED THREATS
The threats detailed in [ST], chapter 3.3 (Threats) do not suppose a risk for the product Winbond
SpiFlash TrustME Secure Flash Memory W75F32WWJB\W75F32WWJC version A, although the
agents implementing attacks have the attack potential High according to assurance level EAL5 +
ALC_DVS.2 + AVA_VAN.5 and always fulfilling the usage assumptions and the proper security
policies satisfaction.
For any other threat not included in this list, the evaluation results of the product security
properties and the associated certificate, do not guarantee any resistance.
OPERATIONAL ENVIRONMENT FUNCTIONALITY
The TOE requires the cooperation from its operational environment to fulfil some of the objectives
of the defined security problem.
The security objectives declared for the TOE operational environment are detailed in [ST], chapter
4.2 (Security objectives for the operational environment).
The details of the product operational environment (assumptions, threats and organisational
security policies) and the TOE security requirements are included in the associated security target.
ARCHITECTURE
LOGICAL ARCHITECTURE
The main security features of the TOE are described as follows:
 Secure separation between Test mode and User mode. More precisely:
- The switch from User mode to Test mode can only be done after completely erasing
the flash content.
- The confidentiality and the integrity of the flash content are protected in both Test
mode and User mode.
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 The confidentiality and the integrity of the transmitted data from/to the Host device are
protected by a secure channel.
 Integrity protection of the flash content by error detection codes (CRC-32).
 Confidentiality protection of the flash content by memory scrambling with diversified key.
 Security sensors or detectors including power glitch detector and out-of-specified operating
conditions (voltage, temperature, clock frequency).
 Active Shields against physical intrusive attacks (e.g. reverse-engineering, probing).
 State machine protection to counter fault injection.
 Dual Flip-Flops and bus encoding to counter fault injection and information leakage.
 Failure counter to detect and react to tamper attempts.
The logical interface of the TOE is made of Flash commands.
PHYSICAL ARCHITECTURE
The physical architecture is depicted in the following figure. The TOE is delimited by the red box.
The TOE consists of the following Hardware components:
 Auxiliary array contains the flash specific data: the binding key (and its digest value), the
failure and session counters;
 Flash array stores the User data (i.e. the mass data including executable codes) and
translates SPI commands into Flash operations;
 SFF (Secure Flash Front-end) which implements encrypted and authenticated interface for
Flash operation and supports Flash memories up to 4GB;
 Detectors of abnormal operating conditions.
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The physical interface of the TOE with the external environment is the entire surface of the
Memory Flash module.
The electrical interface of the TOE with the external environment is made of the chip’s pads
including the data pins for SPI bus:
 Standard SPI: CLK, /CS, DI_IO0, DO_IO1.
 Quad SPI: CLK, /CS, DI_IO0, DO_IO1, IO2, IO3.
 Octal: CLK, /CS, DI_IO0, DO_IO1, IO2, IO3, IO4, IO5, IO6, IO7.
DOCUMENTS
The product includes the following documents that shall be distributed and made available
together to the users of the evaluated version.
 W75F32WWJB Secure Flash Operational User Guidance (version I).
 W75F32WWJB Secure Flash Preparative User Guidance (version H).
 W75F32WWJC Secure Flash Operational User Guidance (version I).
 W75F32WWJC Secure Flash Preparative User Guidance (version H).
 SFI IP Functional Specification Doc ID: S6065-AAG078.10 (version D).
 SFI IP Functional Specification Doc ID: S6065-AAG078.9 (version D).
 TrustME™ W75xxBx/W75xxCx 1.8V 32M-bit Secure Serial Flash (version D).
The developer has executed test for all the security functions. All the tests have been performed by
the developer in its premises, with a satisfactory result.
During the evaluation process it has been verified each unit test checking that the security
functionality that covers is been identified and also that the kind of test is appropriate to the
function that is intended to test.
All the tests have been developed using the testing scenario appropriate to the established
architecture in the security target. It has also been checked that the obtained results during the
tests fit or correspond to the previously estimated results.
To verify the results of the developer tests, the evaluator has applied sampling strategy and has
concluded that the information is complete and coherent enough to reproduce tests and identify
the functionality tested.
In addition, the lab has devised a test for each of the security function of the product verifying that
the obtained results are consistent with the results obtained by the developer.
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It has been checked that the obtained results conform to the expected results and in the cases
where a deviation in respect to the expected results was present, the evaluator has confirmed that
this variation neither represents any security problem nor a decrease in the functional capacity of
the product.
PENETRATION TESTING
Based on the list of potential vulnerabilities applicable to the TOE in is operational environment
[JILAAPS], the evaluation team has devised vulnerability analysis and attack scenarios for
penetration testing according to JIL supporting documents [JILAAPS] and [JILADVARCS]. Within
these activities all aspects of the security architecture which were not covered by functional testing
have been considered.
No attack scenario with the attack potential high according to Common Criteria v3.1 R5 has been
successful in the TOE’s operational environment as defined in the security target and the
operational guidance [OPE_B] and [OPE_C] when all security measures required by the developer
are applied.
EVALUATED CONFIGURATION
The TOE is defined by its commercial name and version number:
- Winbond W75F32WWJB/W75F32WWJC Secure Flash Memory version A.
The acceptance procedure for the evaluated configuration of the TOE is described in section 2
“Acceptance procedure” of the preparative user guidance [PRE_B] and [PRE_C].
The identifiers used to mark the evaluated configuration for WT5F32WWJB of the TOE are:
The identifiers used to mark the evaluated configuration for WT5F32WWJC of the TOE are:
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EVALUATION RESULTS
The product Winbond SpiFlash TrustME Secure Flash Memory W75F32WWJB\W75F32WWJC
version A has been evaluated against the Security Target W75F32WWJB\W75F32WWJC Secure
Flash Memory Security Target (version 3.1).
All the assurance components required by the evaluation level EAL5 + ALC_DVS.2 + AVA_VAN.5
have been assigned a “PASS” verdict. Consequently, the laboratory Applus Laboratories assigns the
“PASS” VERDICT to the whole evaluation due all the evaluator actions are satisfied for the
evaluation level EAL5 + ALC_DVS.2 + AVA_VAN.5, as defined by the Common Criteria v3.1 R5 and
the CEM v3.1 R5.
COMMENTS & RECOMMENDATIONS FROM THE EVALUATION TEAM
Next, recommendations regarding the secure usage of the TOE are provided. These have been
collected along the evaluation process and are detailed to be considered when using the product.
 To follow the security guidance’s of the TOE strictly
 To keep the TOE under personal control and set all other security measures available from the
environment.
CERTIFIER RECOMMENDATIONS
Considering the obtained evidences during the instruction of the certification request of the
product Applus Laboratories, a positive resolution is proposed.
The certifier strongly recommends to the TOE consumer to strictly follow the security
recommendations that can be found on Appendix 1 “Security rules” of [OPE_B] and [OPE_C] and to
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observe the operational environment requirements and assumptions defined in the applicable
security target.
GLOSSARY
CCN Centro Criptológico Nacional
CNI Centro Nacional de Inteligencia
EAL Evaluation Assurance Level
ETR Evaluation Technical Report
OC Organismo de Certificación
TOE Target Of Evaluation
BIBLIOGRAPHY
[CC_P1] Common Criteria for Information Technology Security Evaluation Part 1: Introduction and
general model, Version 3.1, R5 Final, April 2017.
[CC_P2] Common Criteria for Information Technology Security Evaluation Part 2: Security functional
components, Version 3.1, R5 Final, April 2017.
[CC_P3] Common Criteria for Information Technology Security Evaluation Part 3: Security assurance
components, Version 3.1, R5 Final, April 2017.
[CEM] Common Methodology for Information Technology Security Evaluation: Version 3.1, R5 Final,
April 2017.
[JILAAPS] Application of Attack Potential to Smartcards. Joint Interpretation Library. Version 2.9.
January 2013. Joint Interpretation Library
[JILADVARCS] Security Architecture requirements (ADV_ARC) for Smart Cards and similar devices,
version 2.0. January 2012. Joint Interpretation Library.
[CCDB-2006-04-004] ST sanitising for publication. CCMC. April 2006.
[ST] W75F32WWJB\W75F32WWJC Secure Flash Memory Security Target (version 3.1).
[ST Lite] W75F32WWJB\W75F32WWJC Secure Flash Memory Security Target - Public (version 3.2).
[OPE_B] W75F32WWJB Secure Flash Operational User Guidance (version I).
[OPE_C] W75F32WWJC Secure Flash Operational User Guidance (version I).
[PRE_B] W75F32WWJB Secure Flash Preparative User Guidance (version H).
[PRE_C] W75F32WWJC Secure Flash Preparative User Guidance (version H).
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SECURITY TARGET / SECURITY TARGET LITE
Along with this certification report, the complete security target of the evaluation is stored and
protected in the Certification Body premises. This document is identified as:
- W75F32WWJB\W75F32WWJC Secure Flash Memory Security Target (version 3.1).
The public version of this document constitutes the ST Lite. The ST Lite has also been reviewed for
the needs of publication according to [CCDB-2006-04-004], and it is published along with this
certification report in the Certification Body and CCRA websites. The ST Lite identifier is:
- W75F32WWJB\W75F32WWJC Secure Flash Memory Security Target - Public (version 3.2).
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RECOGNITION AGREEMENTS
In order to avoid multiple certification of the same product in different countries a mutual
recognition of IT security certificates - as far as such certificates are based on ITSEC or CC - under
certain conditions was agreed.
European Recognition of ITSEC/CC – Certificates (SOGIS-MRA)
The SOGIS-Mutual Recognition Agreement (SOGIS-MRA) Version 3 became effective in April 2010. It
defines the recognition of certificates for IT-Products at a basic recognition level and, in addition, at
higher recognition levels for IT-Products related to certain SOGIS Technical Domains only.
The basic recognition level includes Common Criteria (CC) Evaluation Assurance Levels EAL 1 to EAL
4 and ITSEC Evaluation Assurance Levels E1 to E3 (basic). For "Smartcards and similar devices" a
SOGIS Technical Domain is in place. For "HW Devices with Security Boxes" a SOGIS Technical
Domains is in place, too. In addition, certificates issued for Protection Profiles based on Common
Criteria are part of the recognition agreement.
The new agreement has been signed by the national bodies of Austria, Finland, France, Germany,
Italy, The Netherlands, Norway, Spain, Sweden and the United Kingdom. The current list of
signatory nations and approved certification schemes, details on recognition, and the history of the
agreement can be seen on the website at https://www.sogis.org.
The SOGIS-MRA logo printed on the certificate indicates that it is recognised under the terms of this
agreement by the nations listed above.
The certificate of this TOE is recognized under SOGIS-MRA for all assurance components selected.
International Recognition of CC – Certificates (CCRA)
The international arrangement on the mutual recognition of certificates based on the CC (Common
Criteria Recognition Arrangement, CCRA-2014) has been ratified on 08 September 2014. It covers
CC certificates based on collaborative Protection Profiles (cPP) (exact use), CC certificates based on
assurance components up to and including EAL 2 or the assurance family Flaw Remediation
(ALC_FLR) and CC certificates for Protection Profiles and for collaborative Protection Profiles (cPP).
The CCRA-2014 replaces the old CCRA signed in May 2000 (CCRA-2000). Certificates based on CCRA-
2000, issued before 08 September 2014 are still under recognition according to the rules of CCRA-
2000. For on 08 September 2014 ongoing certification procedures and for Assurance Continuity
(maintenance and re-certification)of old certificates a transition period on the recognition of
certificates according to the rules of CCRA-2000 (i.e. assurance components up to and including EAL
4 or the assurance family Flaw Remediation (ALC_FLR)) is defined until 08 September 2017.
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As of September 2014 the signatories of the new CCRA-2014 are government representatives from
the following nations: Australia, Austria, Canada, Czech Republic, Denmark, Finland, France,
Germany, Greece, Hungary, India, Israel, Italy, Japan, Malaysia, The Netherlands, New Zealand,
Norway, Pakistan, Republic of Korea, Singapore, Spain, Sweden, Turkey, United Kingdom, and the
United States.
The current list of signatory nations and approved certification schemes can be seen on the
website: http://www.commoncriteriaportal.org.
The Common Criteria Recognition Arrangement logo printed on the certificate indicates that this
certification is recognised under the terms of this agreement by the nations listed above.
The certificate of this TOE is recognized under CCRA for all assurance components up to EAL2 and
ALC_FLR.