TÜV Rheinland Nederland B.V.
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Version
2021-04
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Certification Report
W77Q16/32 version C
Sponsor and developer: Winbond Electronics Corporation
No. 8, Keya 1st Rd., Daya Dist.,
Taichung City 428
Taiwan R.O.C
Evaluation facility: SGS Brightsight B.V.
Brassersplein 2
2612 CT Delft
The Netherlands
Report number: NSCIB-CC-0308282-CR
Report version: 1
Project number: 0308282
Author(s): Jordi Mujal
Date: 08 September 2021
Number of pages: 11
Number of appendices: 0
Reproduction of this report is authorised only if the report is reproduced in its entirety.
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CONTENTS
Foreword 3
Recognition of the Certificate 4
International recognition 4
European recognition 4
1 Executive Summary 5
2 Certification Results 6
2.1 Identification of Target of Evaluation 6
2.2 Security Policy 6
2.3 Assumptions and Clarification of Scope 6
2.3.1 Assumptions 6
2.3.2 Clarification of scope 6
2.4 Architectural Information 6
2.5 Documentation 7
2.6 IT Product Testing 7
2.6.1 Testing approach and depth 7
2.6.2 Independent penetration testing 7
2.6.3 Test configuration 8
2.6.4 Test results 8
2.7 Reused Evaluation Results 8
2.8 Evaluated Configuration 8
2.9 Evaluation Results 8
2.10 Comments/Recommendations 8
3 Security Target 10
4 Definitions 10
5 Bibliography 11
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Foreword
The Netherlands Scheme for Certification in the Area of IT Security (NSCIB) provides a third-party
evaluation and certification service for determining the trustworthiness of Information Technology (IT)
security products. Under this NSCIB, TÜV Rheinland Nederland B.V. has the task of issuing
certificates for IT security products, as well as for protection profiles and sites.
Part of the procedure is the technical examination (evaluation) of the product, protection profile or site
according to the Common Criteria assessment guidelines published by the NSCIB. Evaluations are
performed by an IT Security Evaluation Facility (ITSEF) under the oversight of the NSCIB Certification
Body, which is operated by TÜV Rheinland Nederland B.V. in cooperation with the Ministry of the
Interior and Kingdom Relations.
An ITSEF in the Netherlands is a commercial facility that has been licensed by TÜV Rheinland
Nederland B.V. to perform Common Criteria evaluations; a significant requirement for such a licence is
accreditation to the requirements of ISO Standard 17025 “General requirements for the accreditation
of calibration and testing laboratories”.
By awarding a Common Criteria certificate, TÜV Rheinland Nederland B.V. asserts that the product or
site complies with the security requirements specified in the associated (site) security target, or that
the protection profile (PP) complies with the requirements for PP evaluation specified in the Common
Criteria for Information Security Evaluation. A (site) security target is a requirements specification
document that defines the scope of the evaluation activities.
The consumer should review the (site) security target or protection profile, in addition to this
certification report, to gain an understanding of any assumptions made during the evaluation, the IT
product's intended environment, its security requirements, and the level of confidence (i.e., the
evaluation assurance level) that the product or site satisfies the security requirements stated in the
(site) security target.
Reproduction of this report is authorised only if the report is reproduced in its entirety.
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Recognition of the Certificate
The presence of the Common Criteria Recognition Arrangement (CCRA) and the SOG-IS logos on the
certificate indicates that this certificate is issued in accordance with the provisions of the CCRA and
the SOG-IS Mutual Recognition Agreement (SOG-IS MRA) and will be recognised by the participating
nations.
International recognition
The CCRA was signed by the Netherlands in May 2000 and provides mutual recognition of certificates
based on the Common Criteria (CC). Since September 2014 the CCRA has been updated to provide
mutual recognition of certificates based on cPPs (exact use) or STs with evaluation assurance
components up to and including EAL2+ALC_FLR.
For details of the current list of signatory nations and approved certification schemes, see
http://www.commoncriteriaportal.org.
European recognition
The SOG-IS MRA Version 3, effective since April 2010, provides mutual recognition in Europe of
Common Criteria and ITSEC certificates at a basic evaluation level for all products. A higher
recognition level for evaluation levels beyond EAL4 (respectively E3-basic) is provided for products
related to specific technical domains. This agreement was signed initially by Finland, France,
Germany, The Netherlands, Norway, Spain, Sweden and the United Kingdom. Italy joined the SOG-IS
MRA in December 2010.
For details of the current list of signatory nations, approved certification schemes and the list of
technical domains for which the higher recognition applies, see https://www.sogis.eu.
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1 Executive Summary
This Certification Report states the outcome of the Common Criteria security evaluation of the
W77Q16/32 version C. The developer of the W77Q16/32 version C is Winbond Electronics
Corporation located in Taichung City, Taiwan and they also act as the sponsor of the evaluation and
certification. A Certification Report is intended to assist prospective consumers when judging the
suitability of the IT security properties of the product for their particular requirements.
The TOE is a Memory Flash IC. The TOE is dedicated to be embedded into systems that need
protection of their memory contents. In particular, the TOE is dedicated to the secure storage of the
code and data for IoT applications.
The TOE has been evaluated by SGS Brightsight B.V. located in Delft, The Netherlands. The
evaluation was completed on 08 September 2021 with the approval of the ETR. The certification
procedure has been conducted in accordance with the provisions of the Netherlands Scheme for
Certification in the Area of IT Security [NSCIB].
The scope of the evaluation is defined by the security target [ST], which identifies assumptions made
during the evaluation, the intended environment for the W77Q16/32 version C, the security
requirements, and the level of confidence (evaluation assurance level) at which the product is
intended to satisfy the security requirements. Consumers of the W77Q16/32 version C are advised to
verify that their own environment is consistent with the security target, and to give due consideration to
the comments, observations and recommendations in this certification report.
The results documented in the evaluation technical report [ETR]
1
for this product provide sufficient
evidence that the TOE meets the EAL2 augmented (EAL2+) assurance requirements for the evaluated
security functionality. This assurance level is augmented with ALC_FLR.2 (Flaw Reporting
Procedures).
The evaluation was conducted using the Common Methodology for Information Technology Security
Evaluation, Version 3.1 Revision 5 [CEM] for conformance to the Common Criteria for Information
Technology Security Evaluation, Version 3.1 Revision 5 [CC] (Parts I, II and III).
TÜV Rheinland Nederland B.V., as the NSCIB Certification Body, declares that the evaluation meets
all the conditions for international recognition of Common Criteria Certificates and that the product will
be listed on the NSCIB Certified Products list. Note that the certification results apply only to the
specific version of the product as evaluated.
1
The Evaluation Technical Report contains information proprietary to the developer and/or the
evaluator, and is not available for public review.
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2 Certification Results
2.1 Identification of Target of Evaluation
The Target of Evaluation (TOE) for this evaluation is the W77Q16/32 version C from Winbond
Electronics Corporation located in Taichung City, Taiwan.
The TOE is comprised of the following main components:
Delivery
item type
Identifier Version
Hardware
W77Q
[16/32]JW[W/R/SF/SS/ST/SN/SV/ZP/TB/TC/XF/XG/XH/UU/UX/
UZ/BY/BJ/BK]
C
To ensure secure usage a set of guidance documents is provided, together with the W77Q16/32
version C. For details, see section 2.5 “Documentation” of this report.
2.2 Security Policy
The TOE comprises all security functionality necessary to ensure the secure execution of the Memory
Flash:
 Secure separation between Test mode and User mode.
 Protection against leakage and physical attacks.
 Confidentiality, Authenticity and integrity of Secret User Data.
 Authenticity and integrity of Authenticated User Data.
 Integrity protection of the flash content by error detection codes.
 Memory Rollback protection, Irreversibility-Anchor and Clone Replace Protection.
 Secure Communication Channel with the host device and a remote operator.
 Memory Access Control of the flash content by implementing an access control policy.
 Protection of the secure boot of the Host Device and secure update process.
 Secure Key Provisioning Mechanism.
2.3 Assumptions and Clarification of Scope
2.3.1 Assumptions
The assumptions defined in the Security Target are not covered by the TOE itself. These aspects lead
to specific Security Objectives to be fulfilled by the TOE-Environment. For detailed information on the
security objectives that must be fulfilled by the TOE environment, see section 3.5 of the [ST].
2.3.2 Clarification of scope
The evaluation did not reveal any threats to the TOE that are not countered by the evaluated security
functions of the product.
2.4 Architectural Information
The architecture of the Memory Flash is described in the figure below. The TOE includes only the
W77Q16/32 device. The MCU and SPI bus appearing in this diagram are not part of the TOE.
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The TOE consists of the following Hardware components:
 Main Flash Array: stores the User data (i.e. the mass data including executable code).
 Auxiliary array: contains the TSF data, including: keys, secure configurations, Winbond
unique ID (WID), Monotonic Counter etc.
 Secure Functions: implements the TSF, including data encryption, command authentication,
access privileges management, Secure Channel support.
 SFL (Standard Flash Logic): implements datapath for plain access to the unprotected areas
of the Main Array (as in standard Flash devices).
 SPI Interface: supports communication over the SPI bus.
2.5 Documentation
The following documentation is provided with the product by the developer to the customer:
Identifier Version
W77Q16JW/W77Q32JW Operational User Guidance C
W77Q16JW/W77Q32JW Preparative Procedure C
W77Q - Secure Serial NOR Flash Memory Security Manual A7
W77Q - Secure Serial NOR Flash Memory Data Sheet A6
2.6 IT Product Testing
Testing (depth, coverage, functional tests, independent testing): The evaluators examined the
developer’s testing activities documentation and verified that the developer has met their testing
responsibilities.
2.6.1 Testing approach and depth
The developer provided documentation evidence covering several test scenarios. In each of the
scenarios several TSFIs were tested. The evaluators examined the tests and all results were as
expected.
For the testing performed by the evaluators, the developer provided samples and a test environment.
The evaluators reproduced a selection of the developer tests, as well as a small number of test cases
designed by the evaluator.
2.6.2 Independent penetration testing
To identify potential vulnerabilities, the evaluator performed the following activities:
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 The evaluators analysed the TOE guidance, functional specification, TOE design and architecture
description in order to identify potential vulnerabilities.
 Publicly available sources of information such as scientific papers, books and online databases
were examined. In particular, the CWE database was checked.
 Internal Lab discussions. Previous experience was shared between evaluators during internal
discussions
 Vulnerability analysis and attack potential calculations based on [JIL-AAPS] was considered.
The total test effort expended by the evaluators was 4 weeks. During that test campaign, 33,3% of the
total time was spent on Perturbation attacks, 33,3% on side-channel testing, and 33,3% on logical
tests.
2.6.3 Test configuration
The configuration of the sample used for testing and penetration testing was the same as described in
the [ST]. As a part of the work package the evaluators initialized the TOE as required by the TOE
guidance.
2.6.4 Test results
The testing activities, including configurations, procedures, test cases, expected results and observed
results are summarised in the [ETR], with references to the documents containing the full details.
The developer’s tests and the independent functional tests produced the expected results, giving
assurance that the TOE behaves as specified in its [ST] and functional specification.
No exploitable vulnerabilities were found with the independent penetration tests.
The algorithmic security level of cryptographic functionality has not been rated in this certification
process, but the current consensus on the algorithmic security level in the open domain, i.e., from the
current best cryptanalytic attacks published, has been taken into account.
For composite evaluations, please consult the [ETRfC] for details.
2.7 Reused Evaluation Results
There is no reuse of evaluation results in this certification.
2.8 Evaluated Configuration
The TOE is defined uniquely by its name and version number W77Q16/32 version C.
2.9 Evaluation Results
The evaluation lab documented their evaluation results in the [ETR], which references an ASE
Intermediate Report and other evaluator documents. To support composite evaluations according to
[JIL-COMP] a derived document [ETRfC] was provided and approved. This document provides details
of the TOE evaluation that must be considered when this TOE is used as platform in a composite
evaluation.
The verdict of each claimed assurance requirement is “Pass”.
Based on the above evaluation results the evaluation lab concluded the W77Q16/32 version C, to be
CC Part 2 extended, CC Part 3 conformant, and to meet the requirements of EAL 2 augmented
with ALC_FLR.2. This implies that the product satisfies the security requirements specified in Security
Target [ST].
2.10 Comments/Recommendations
The user guidance as outlined in section 2.5 “Documentation” contains necessary information about
the usage of the TOE. Certain aspects of the TOE’s security functionality, in particular the
countermeasures against attacks, depend on accurate conformance to the user guidance of the TOE.
There are no particular obligations or recommendations for the user apart from following the user
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guidance. Please note that the documents contain relevant details concerning the resistance against
certain attacks.
In addition, all aspects of assumptions, threats and policies as outlined in the Security Target not
covered by the TOE itself must be fulfilled by the operational environment of the TOE.
The customer or user of the product shall consider the results of the certification within his system risk
management process. For the evolution of attack methods and techniques to be covered, the
customer should define the period of time until a re-assessment for the TOE is required and thus
requested from the sponsor of the certificate.
The strength of the cryptographic algorithms and protocols was not rated in the course of this
evaluation. This specifically applies to the following proprietary or non-standard algorithms, protocols
and implementations: None.
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3 Security Target
The W77Q[16/32]JW[W/R/SF/SS/ST/SN/SV/ZP/TB/TC/XF/XG/XH/UU/UX/UZ/BY/BJ/BK] Secure Flash
Memory Security Target, Version F [ST] is included here by reference.
Please note that, to satisfy the need for publication, a public version [ST-lite] has been created and
verified according to [ST-SAN].
4 Definitions
This list of acronyms and definitions contains elements that are not already defined by the CC or CEM:
IC Integrated Circuit
IT Information Technology
ITSEF IT Security Evaluation Facility
JIL Joint Interpretation Library
MCU MicroController (unit)
NSCIB Netherlands Scheme for Certification in the area of IT Security
PP Protection Profile
SFL Standard Flash Logic
SPI Serial Peripheral Interface
TOE Target of Evaluation
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5 Bibliography
This section lists all referenced documentation used as source material in the compilation of this
report.
[CC] Common Criteria for Information Technology Security Evaluation, Parts I, II
and III, Version 3.1 Revision 5, April 2017
[CEM] Common Methodology for Information Technology Security Evaluation,
Version 3.1 Revision 5, April 2017
[ETR] Evaluation Technical Report “W77Q16/32 Secure Flash Memory version C”
– EAL2+, v6.0, 08 September 2021
[ETRfC] Evaluation Technical Report for Composition “W77Q16/32 Secure Flash
Memory version C” – EAL2+, v5.0, 08 September 2021
[JIL-AAPS] JIL Application of Attack Potential to Smartcards, Version 3.1, June 2020
[JIL-AM] Attack Methods for Smartcards and Similar Devices, Version 2.4, January
2020 (sensitive with controlled distribution)
[JIL-COMP] Composite product evaluation for Smartcards and similar devices, version
1.5.1, May 2018.
[NSCIB] Netherlands Scheme for Certification in the Area of IT Security, Version
2.5, 28 March 2019
[ST] W77Q[16/32]JW[W/R/SF/SS/ST/SN/SV/ZP/TB/TC/XF/XG/XH/UU/UX/UZ/B
Y/BJ/BK] Secure Flash Memory Security Target, Version F
[ST-lite] W77Q[16/32]JW[W/R/SF/SS/ST/SN/SV/ZP/TB/TC/XF/XG/XH/UU/UX/UZ/B
Y/BJ/BK] Secure Flash Memory Security Target Lite, Version F.
[ST-SAN] ST sanitising for publication, CC Supporting Document CCDB-2006-04-
004, April 2006
(This is the end of this report.)