TÜV Rheinland Nederland B.V.
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Certification Report
Fort Fox Hardware Data Diode FFHDD3_1/10
Sponsor and developer: Fox Crypto B.V.
Olof Palmestraat 6
2616 LM Delft
The Netherlands
Evaluation facility: Riscure B.V.
Delftechpark 49
2628 XJ Delft
The Netherlands
Report number: NSCIB-CC-163925-CR
Report version: 1
Project number: 163925
Author(s): Twan van der Schoot
Date: 11 July 2018
Number of pages: 11
Number of appendices: 0
Reproduction of this report is authorized provided the report is reproduced in its entirety.
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CONTENTS:
Foreword 4
Recognition of the certificate 5
International recognition 5
European recognition 5
1 Executive Summary 6
2 Certification Results 7
2.1 Identification of Target of Evaluation 7
2.2 Security Policy 7
2.3 Assumptions and Clarification of Scope 7
2.4 Architectural Information 8
2.5 Documentation 9
2.6 IT Product Testing 9
2.7 Evaluated Configuration 10
2.8 Results of the Evaluation 10
2.9 Comments/Recommendations 10
3 Security Target 11
4 Definitions 11
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 license 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, in order 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 authorized provided the report is reproduced in its entirety.
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Recognition of the certificate
Presence of the Common Criteria Recognition Arrangement and SOG-IS logos on the certificate
indicates that this certificate is issued in accordance with the provisions of the CCRA and the SOG-IS
agreement and will be recognised by the participating nations
International recognition
The CCRA has been signed by the Netherlands in May 2000 and provides mutual recognition of
certificates based on the CC. Starting 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. The current list of signatory nations and approved certification
schemes can be found on: http://www.commoncriteriaportal.org.
European recognition
The European SOGIS-Mutual Recognition Agreement (SOGIS-MRA) version 3 effective from April
2010 provides mutual recognition of Common Criteria and ITSEC certificates at a basic evaluation
level for all products. A higher recognition level for evaluation levels beyond EAL4 (resp. E3-basic) is
provided for products related to specific technical domains. This agreement was initially signed by
Finland, France, Germany, The Netherlands, Norway, Spain, Sweden and the United Kingdom. Italy
joined the SOGIS-MRA in December 2010. The current list of signatory nations, approved certification
schemes and the list of technical domains for which the higher recognition applies can be found on:
http://www.sogisportal.eu.
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1 Executive Summary
This Certification Report states the outcome of the Common Criteria security evaluation of the Fort
Fox Hardware Data Diode FFHDD3_1/10. The developer of the Fort Fox Hardware Data Diode
FFHDD3_1/10 is Fox Crypto B.V. located in Delft, The Netherlands, 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 Target of Evaluation – TOE (i.e., Fort Fox Hardware Data Diode FFHDD3_1/10) is a hardware-
only device that allows data to travel only in one direction. The purpose of the TOE is to allow
information to be transferred optically from one network (the upstream network) to another network
(the downstream network). The unidirectional data flow ensures the integrity of the upstream network
against threats from the downstream network, and simultaneously ensures the confidentiality of the
downstream network.
The TOE has been evaluated by Riscure B.V. located in Delft, The Netherlands. The evaluation was
completed on 11-07-2018 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 Fort Fox Hardware Data Diode FFHDD3_1/10,
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 Fort Fox Hardware Data
Diode FFHDD3_1/10 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 it meets the EAL7 augmented (EAL7+) assurance requirements for the evaluated
security functionality. This assurance level is augmented with ASE_TSS.2 (TOE summary
specification with architectural design summary) and ALC_FLR.3 (Systematic flaw remediation).
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].
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. It should be noted that the certification results only apply
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 releasable 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 Fort Fox Hardware Data Diode FFHDD3_1/10
from Fox Crypto B.V. located in Delft, The Netherlands.
The TOE is a single hardware unit:
Delivery item type Identifier Version Model number
Hardware
(metal enclosure containing
PCB with electronic
components)
Fort Fox Hardware Data Diode
FFHDD3_1 FDD1GI
FFHDD3_10 FDD10GI
The TOE is assembled, tested and packaged for delivery to Fox Crypto B.V. by TBP Electronics in
Dirksland, The Netherlands. Before the TOE is packaged and dispatched to Fox Crypto B.V. a Fox
Crypto B.V. employee performs several tests visual as well as electronic tests at the site of TBP
Electronics. When the TOE arrives at Fox Crypto B.V. visual checks are performed on the integrity of
the packaging and documentation, as well as functional testing.
To ensure secure usage a set of guidance documents is provided together with the Fort Fox Hardware
Data Diode FFHDD3_1/10. Details can be found in section 2.5 of this report.
2.2 Security Policy
The TOE is a hardware data diode that allows information to be transferred optically from one network
(the upstream network) to another network (the downstream network). The unidirectionality of the data
flow ensures the integrity of the upstream network against threats from the downstream network, and
simultaneously ensures the confidentiality of the downstream network. Once manufactured, there is no
way to alter the function of the TOE.
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. Detailed information on these
security objectives that must be fulfilled by the TOE environment can be found in section 4.2 of the
[ST].
2.3.2 Clarification of scope
There are no defined threats for the TOE that require additional measures in the environment; they are
all met by the TOE. The Security Target [ST] assumes an operational environment such that threats
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could come only from the attached networks. The evaluation did not reveal any functionality in the
TOE that was excluded from the TOE evaluated configuration.
2.4 Architectural Information
The Target of Evaluation (TOE) consists of a single hardware unit, see figure 1. The TOE Fort Fox
Hardware Data Diode is a unidirectional network and only allows data to flow in one direction. The one
way physical connection of the TOE allows information to be transferred optically from one network
(the upstream network) to another network (the downstream network). The unidirectionality of the data
flow ensures the integrity of the upstream network against threats from the downstream network, and
simultaneously ensures the confidentiality of the downstream network. To ensure signals can only
pass in one direction, and not vice versa, the TOE deploys a single light source as the only connection
to the downstream network. Fiber-optic cables are used to connect the TOE to both the upstream and
downstream networks in order to minimize electromagnetic coupling. Physical restrictions on the
environment ensure that the unidirectionality of the dataflow cannot be bypassed.
Figure 1: The TOE as a single hardware unit
The system design decomposes the TOE in two subsystems, "Power" and "Data Diode", as presented
in blue and orange in Figure 2. In this diagram, the four TSFIs of the system are visible: power, LEDs,
Upstream and Downstream. The security function is implemented by the Downstream interface in the
Data Diode subsystem. There is no electrical path for the Downstream interface to present data to the
Upstream interface.
Figure 2: TOE subsystems extract
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The TOE protects itself against interference and logical tampering by:
• Consisting of hardware only with no memory, settings, or other parameters that can be
changed.
• Having only two interfaces that are accessible to attackers, which allow only very limited
interaction:
o The upstream interface: the TOE passes through all data received here without
interpreting this data;
o The downstream interface: the TOE ignores all data received here so that even if
there were memory, settings or other parameters that could be changed in the TOE,
there would be no way to tamper or interfere with these settings.
The TOE protects itself against bypass by ensuring that all data flows must pass through a single
SFR-enforcing component (which is the first component encountered from the downstream interface),
thus preventing bypass “through” the TOE.
2.5 Documentation
The following documentation is provided with the product by the developer to the customer:
Identifier Version
Installation Manual for the Fox Data Diode version 3 Rackmount
Products FDDv3-1r-F and FDDv3-10r-F
2018-06-27, V1.0 Final
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 defined three test scopes "Design Scope", "Unit Scope" and "Batch" scope:
• The "Design Scope" tests are applied to verify the correct functioning according to design
rationale and functional specification.
• The "Unit Scope" tests are applied to each manufactured unit and confirm TOE integrity and
function.
• The "Batch Scope" tests are applied to samples of manufactured batches, and verify correct
functionality under abnormal operating conditions.
The evaluator confirmed that the developer is testing all TSF and related security mechanisms,
subsystems and modules in order to assure complete coverage of all SFR.
Amount of testing performed by the developer:
• The tests are performed on security mechanisms and on subsystem and module level.
• As demonstrated by ATE_COV.3 the developer has tested all security mechanisms and
TSFIs.
• As demonstrated by ATE_DPT.4 the developer has tested all the TSF subsystems and
modules against the TOE design and against the security architecture description.
For the testing performed by the evaluators, the developer has provided samples and a test
environment. The evaluators have reproduced a selection of the developer tests, as well as a small
number of test cases designed by the evaluator.
The independent testing includes one evaluator test, to determine the correct function of the power
converter module.
2.6.2 Independent Penetration Testing
At the start of the test the TOE is identified by means of visual inspection of the internal components
and comparison to the implementation representation.
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The evaluator independent penetration tests were conducted according to the following testing
approach:
• During evaluation of the ADV, ATE and ALC classes the evaluators have not identified
potential vulnerabilities.
The analysis in AVA used the design knowledge gained in particular from the analysis in
ADV_IMP.
• Next, the evaluator analysed the TOE design and implementation for resistance against all
known attack techniques, similar to what is found in [JIL-AM] although the TOE is clearly not a
smart card or similar device. This resulted in one potential vulnerability to be tested.
• The evaluator made an analysis of the TOE in its intended environment to check whether the
developer vulnerability analysis in ADV_ARC has assessed all information.
2.6.3 Test Configuration
The evaluator has used a test setup and tools described in Appendix A.1 Test environment
configurations of the [ETR].
There are two variants of the TOE, which differ only in the maximum transfer rate. There are no tests
defined in the vulnerability analysis AVA_VAN, or independent testing ATE_IND, where test results
would depend on the TOE variant.
2.6.4 Testing 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.
2.7 Evaluated Configuration
The TOE is defined uniquely by its name and version number Fort Fox Hardware Data Diode
FFHDD3_1/10. The TOE is marked by a model number corresponding to the TOE name and version
as documented in table 1 TOE Versions in section 1.4.2 of the [ST].
The developer issues with each TOE a user installation manual [UM] providing the customer with
detailed instructions on how to assess the integrity of the TOE upon delivery.
2.8 Results of the Evaluation
The evaluation lab documented their evaluation results in the [ETR]
2
which references an ASE
Intermediate Report and other evaluator documents
The verdict of each claimed assurance requirement is “Pass”.
Based on the above evaluation results the evaluation lab concluded the Fort Fox Hardware Data
Diode FFHDD3_1/10, to be CC Part 2 conformant, CC Part 3 conformant, and to meet the
requirements of EAL 7 augmented with ASE_TSS.2 and ALC_FLR.3. This implies that the product
satisfies the security requirements specified in the Security Target [ST].
2.9 Comments/Recommendations
The user guidance as outlined in section 2.5 [UM] 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.
In addition, all aspects of assumptions, threats and policies as outlined in the Security Target not
covered by the TOE itself need to be fulfilled by the operational environment of the TOE.
2
The Evaluation Technical Report contains information proprietary to the developer and/or the
evaluator, and is not releasable for public review.
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The customer or user of the product shall consider the results of the certification within his system risk
management process. In order 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.
It should be noted that the TOE can be delivered to the customer already mounted in a single unit 19”-
rack mount. This configuration still allows the customer to verify the integrity of the TOE upon delivery
as per the installation instructions provided by the developer.
3 Security Target
The Fort Fox Hardware Data Diode Security Target, version 3.04, 2018-06-27 [ST] is included here by
reference.
4 Definitions
This list of Acronyms and the glossary of terms contains elements that are not already defined by the
CC or CEM:
IT Information Technology
ITSEF IT Security Evaluation Facility
JIL Joint Interpretation Library
NSCIB Netherlands Scheme for Certification in the area of IT Security
PP Protection Profile
TOE Target of Evaluation
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 Fort Fox Hardware Data Diode FFHDD3_1/10,
version 1.1, 2018-07-10.
[NSCIB] Netherlands Scheme for Certification in the Area of IT Security, Version 2.4, 27
September 2017.
[ST] Fort Fox Hardware Data Diode Security Target, version 3.04, 2018-06-27.
[JIL-AM] Joint Interpretation Library, Attack Methods for Smartcards and Similar Devices,
Version 2.2, January 2013.
[UM] Fox Crypto B.V., Installation Manual for the Fox Data Diode version 3 Rackmount
Products FDDv3-1r-F and FDDv3-10r-F, version 1.0.
(This is the end of this report).