UNCLASSIFIED / NON CLASSIFIÉ
536-LSS
COMMON CRITERIA CERTIFICATION REPORT
Sphyrna Security Unidirectional Gateway -
Data Diode Identifier: 2010-UG100-SSI
7 September 2021
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FOREWORD
This certification report is an UNCLASSIFIED publication, issued under the authority of the Chief, Communications Security
Establishment (CSE).
The Information Technology (IT) product identified in this certification report, and its associated certificate, has been
evaluated at an approved testing laboratory established under the Canadian Centre for Cyber Security (a branch of CSE).
This certification report, and its associated certificate, applies only to the identified version and release of the product in its
evaluated configuration. The evaluation has been conducted in accordance with the provisions of the Canadian Common
Criteria Program, and the conclusions of the testing laboratory in the evaluation report are consistent with the evidence
adduced.
This report, and its associated certificate, are not an endorsement of the IT product by Canadian Centre for Cyber Security, or
any other organization that recognizes or gives effect to this report, and its associated certificate, and no warranty for the IT
product by the Canadian Centre for Cyber Security, or any other organization that recognizes or gives effect to this report,
and its associated certificate, is either expressed or implied.
If your organization has identified a requirement for this certification report based on business needs and would like more
detailed information, please contact:
Canadian Centre for Cyber Security
Contact Centre and Information Services
contact@cyber.gc.ca | 1-833-CYBER-88 (1-833-292-3788)
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OVERVIEW
The Canadian Common Criteria Program provides a third-party evaluation service for determining the trustworthiness of
Information Technology (IT) security products. Evaluations are performed by a commercial Common Criteria Testing
Laboratory (CCTL) under the oversight of the Certification Body, which is managed by the Canadian Centre for Cyber
Security.
A CCTL is a commercial facility that has been approved by the Certification Body to perform Common Criteria evaluations; a
significant requirement for such approval is accreditation to the requirements of ISO/IEC 17025, the General Requirements
for the Competence of Testing and Calibration Laboratories.
By awarding a Common Criteria certificate, the Certification Body asserts that the product complies with the security
requirements specified in the associated security target. A security target is a requirements specification document that
defines the scope of the evaluation activities. The consumer of certified IT products should review the security target, 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, the evaluated security functionality, and the testing and analysis conducted by the CCTL.
The certification report, certificate of product evaluation and security target are posted to the Common Criteria portal (the
official website of the International Common Criteria Project).
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TABLE OF CONTENTS
EXECUTIVE SUMMARY .................................................................................................................................... 6
1 Identification of Target of Evaluation ........................................................................................................... 7
1.1 Common Criteria Conformance.......................................................................................................................... 7
1.2 TOE Description................................................................................................................................................. 7
1.3 TOE Architecture ............................................................................................................................................... 7
2 Security Policy......................................................................................................................................... 8
3 Assumptions and Clarification of Scope ....................................................................................................... 9
3.1 Usage and Environmental Assumptions.............................................................................................................. 9
3.2 Clarification of Scope ........................................................................................................................................ 9
4 Evaluated Configuration............................................................................................................................10
4.1 Documentation.................................................................................................................................................10
5 Evaluation Analysis Activities....................................................................................................................11
5.1 Development....................................................................................................................................................11
5.2 Guidance Documents........................................................................................................................................11
5.3 Life-Cycle Support ............................................................................................................................................11
6 Testing Activities ....................................................................................................................................12
6.1 Assessment of Developer tests.........................................................................................................................12
6.2 Conduct of Testing...........................................................................................................................................12
6.3 Independent Functional Testing ........................................................................................................................12
6.3.1 Functional Test Results.................................................................................................................................12
6.4 Independent Penetration Testing.......................................................................................................................13
6.4.1 Penetration Test results................................................................................................................................13
7 Results of the Evaluation ..........................................................................................................................14
7.1 Recommendations/Comments..........................................................................................................................14
8 Supporting Content..................................................................................................................................15
8.1 List of Abbreviations.........................................................................................................................................15
8.2 References.......................................................................................................................................................15
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LIST OF FIGURES
TOE Architecture..................................................................................................................................................7
LIST OF TABLES
Table 1: TOE Identification ................................................................................................................................................7
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EXECUTIVE SUMMARY
Sphyrna Security Unidirectional Gateway - Data Diode Identifier: 2010-UG100-SSI (hereafter referred to as the Target of
Evaluation, or TOE), from Sphyrna Security Incorporated , was the subject of this Common Criteria evaluation. A description
of the TOE can be found in Section 1.2. The results of this evaluation demonstrate that the TOE meets the requirements of
the conformance claim listed in Section 1.1 for the evaluated security functionality.
Lightship Security is the CCTL that conducted the evaluation. This evaluation was completed on 7 September 2021 and was
carried out in accordance with the rules of the Canadian Common Criteria Program.
The scope of the evaluation is defined by the Security Target, which identifies assumptions made during the evaluation, the
intended environment for the TOE, and the security functional/assurance requirements. Consumers are advised to verify
that their operating environment is consistent with that specified in the security target, and to give due consideration to the
comments, observations, and recommendations in this Certification Report.
The Canadian Centre for Cyber Security, as the Certification Body, declares that this evaluation meets all the conditions of
the Arrangement on the Recognition of Common Criteria Certificates and that the product is listed on the Certified Products
list (CPL) for the Canadian Common Criteria Program and the Common Criteria portal (the official website of the
International Common Criteria Program).
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1 IDENTIFICATION OF TARGET OF EVALUATION
The Target of Evaluation (TOE) is identified as follows:
Table 1: TOE Identification
TOE Name and Version Sphyrna Security Unidirectional Gateway - Data Diode Identifier: 2010-UG100-SSI
Developer Sphyrna Security Incorporated
1.1 COMMON CRITERIA CONFORMANCE
The evaluation was conducted using the Common Methodology for Information Technology Security Evaluation, Version 3.1
Revision 5, for conformance to the Common Criteria for Information Technology Security Evaluation, Version 3.1 Revision 5.
The TOE claims the following conformance:
EAL4+ (ADV_INT.2, ALC_CMC.5, ALC_CMS.5, ALC_DVS.2, ALC_FLR.3, ATE_DPT.2 and AVA_VAN.4)
1.2 TOE DESCRIPTION
The TOE is used to provide a one-way connection between two networks of different security levels. The TOE is the security
enforcing subsystem that ensures that data can only be transmitted in one direction and that no data can be passed, either
explicitly or covertly, in the reverse direction.
1.3 TOE ARCHITECTURE
A diagram of the TOE architecture is as follows:
TOE Architecture
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2 SECURITY POLICY
The TOE implements and enforces policies pertaining to the following security functionality:
 Unidirectional Data Transfer
 Failure with Preservation of Secure State
Complete details of the security functional requirements (SFRs) can be found in the Security Target (ST) referenced in
section 8.2.
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3 ASSUMPTIONS AND CLARIFICATION OF SCOPE
Consumers of the TOE should consider assumptions about usage and environmental settings as requirements for the
product’s installation and its operating environment. This will ensure the proper and secure operation of the TOE.
3.1 USAGE AND ENVIRONMENTAL ASSUMPTIONS
The following assumptions are made regarding the use and deployment of the TOE:
 The TOE will be stored and deployed in accordance with the physical security requirements of the high side
 The TOE is the only method of interconnecting the high-side and low-side networks
 The TOE enclosure is constructed to resist tampering efforts and employs mechanisms to detect and respond to
tamper attempts
3.2 CLARIFICATION OF SCOPE
The physical boundary of the TOE is limited to the hardware components that enforce unidirectional data transfer, which
consists of two physical data diode components, each housed in a tamper resistant case. Together these components
comprise the overall logical data diode (the TOE).
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4 EVALUATED CONFIGURATION
The evaluated configuration for the TOE comprises:
TOE Hardware Sphyrna Security Unidirectional Gateway - Data Diode Identifier: 2010-UG100-SSI
Environmental Support  Connecting equipment. The low side and high side connected network equipment.
 Unidirectional Gateway. The TOE is a subsystem of the Unidirectional Gateway
devices, which consists of a custom 1U tamper-resistant enclosure that houses two
single board computers, two power supplies, and four hard drives (two per
computer in a RAID configuration)
4.1 DOCUMENTATION
The following documents are provided to the consumer to assist in the configuration and installation of the TOE:
a) Sphyrna Security Unidirectional Gateway (Data Diode) User Guide, v1.0.3
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5 EVALUATION ANALYSIS ACTIVITIES
The evaluation analysis activities involved a structured evaluation of the TOE. Documentation and process dealing with
Development, Guidance Documents, and Life-Cycle Support were evaluated.
5.1 DEVELOPMENT
The evaluators analyzed the documentation provided by the vendor; they determined that the design completely and
accurately describes the TOE security functionality (TSF) interfaces and how the TSF implements the security functional
requirements. The evaluators determined that the initialization process is secure, that the security functions are protected
against tamper and bypass, and that security domains are maintained.
5.2 GUIDANCE DOCUMENTS
The evaluators examined the TOE preparative user guidance and operational user guidance and determined that it
sufficiently and unambiguously describes how to securely transform the TOE into its evaluated configuration and how to use
and administer the product. The evaluators examined and tested the preparative and operational guidance and determined
that they are complete and sufficiently detailed to result in a secure configuration.
Section 4.1 provides details on the guidance documents.
5.3 LIFE-CYCLE SUPPORT
An analysis of the TOE configuration management system and associated documentation was performed. The evaluators
found that the TOE configuration items were clearly marked.
The evaluators examined the delivery documentation and determined that it described all the procedures required to
maintain the integrity of the TOE during distribution to the consumer.
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6 TESTING ACTIVITIES
Testing consists of the following three steps: assessing developer tests, performing independent functional tests, and
performing penetration tests.
6.1 ASSESSMENT OF DEVELOPER TESTS
The evaluators verified that the developer has met their testing responsibilities by examining their test evidence, and
reviewing their test results, as documented in the Evaluation Test Report (ETR). The correspondence between the tests
identified in the developer’s test documentation and the functional specification was complete.
6.2 CONDUCT OF TESTING
The TOE was subjected to a comprehensive suite of formally documented, independent functional and penetration tests. The
detailed testing activities, including configurations, procedures, test cases, expected results and observed results are
documented in a separate Test Results document.
6.3 INDEPENDENT FUNCTIONAL TESTING
During this evaluation, the evaluator developed independent functional tests by examining design and guidance
documentation.
All testing was planned and documented to a sufficient level of detail to allow repeatability of the testing procedures and
results. The following testing activities were performed:
a. Repeat of Developer's Tests: The evaluator repeated a subset of the developer's tests
b. Use of Epoxy: The evaluator confirmed the use of epoxy on unused ports of the TOE
c. Use of Y Cable: The evaluator verified that a Y cable is used to backfeed the TX signal to the RX side of the SFP on
the mainboard
d. Single Cable Interconnect: The evaluator confirmed that only a single cable is used to connect the High & Low sides
e. Independent Power Supplies: The evaluator confirmed that the High & Low sides are powered by independent power
supplies
f. Tamper Seals: The evaluator confirmed that the tamper seals used meet the FIPS 140-2 Tamper seal testing
requirements.
6.3.1 FUNCTIONAL TEST RESULTS
The developer’s tests and the independent functional tests yielded the expected results, providing assurance that the TOE
behaves as specified in its ST and functional specification.
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6.4 INDEPENDENT PENETRATION TESTING
The penetration testing effort focused on 4 flaw hypotheses.
 Public Vulnerability based (Type 1)
 Technical community sources (Type 2)
 Evaluation team generated (Type 3)
 Tool Generated (Type 4)
The evaluators conducted an independent review of all evaluation evidence, public domain vulnerability databases and
technical community sources (Type 1 & 2). Additionally, the evaluators used automated vulnerability scanning tools to
discover potential network, platform, and application layer vulnerabilities (Type 4). Based upon this review, the evaluators
formulated flaw hypotheses (Type 3), which they used in their penetration testing effort.
6.4.1 PENETRATION TEST RESULTS
Type 1 & 2 searches were conducted on 6/22/2021 and included the following search terms:
Diode Unintentional EM emanations
from CPU/Memory/Data Bus
on device
Unintentional sonic emanations from
capacitors and mechanical parts. Can also
be sub and ultra-sonic.
Intentional/unintentional optical
emanations from LEDs
Modulating current in power
lines by changing CPU
workload.
Reversing the photoelectric effect (causing
electron-hole recombination in a
photodiode) to emit photons from the
“receiver”.
Vulnerability searches were conducted using the following sources:
Common Vulnerabilities and Exposures (CVE)
(http://cve.mitre.org/)
National Vulnerability Database
(http://nvd.nist.gov/)
CERT (https://www.kb.cert.org/vuls/) Google
(https://www.google.ca/)
The independent penetration testing did not uncover any residual exploitable vulnerabilities in the intended operating
environment.
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7 RESULTS OF THE EVALUATION
The Information Technology (IT) product identified in this certification report, and its associated certificate, has been
evaluated at an approved testing laboratory established under the Canadian Centre for Cyber Security (CCCS). This
certification report, and its associated certificate, apply only to the specific version and release of the product in its
evaluated configuration.
This evaluation has provided the basis for the conformance claim documented in Table 1. The overall verdict for this
evaluation is PASS. These results are supported by evidence in the ETR.
7.1 RECOMMENDATIONS/COMMENTS
It is recommended that all guidance outlined in Section 4.1 be followed to configure the TOE in the evaluated configuration.
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8 SUPPORTING CONTENT
8.1 LIST OF ABBREVIATIONS
Term Definition
CAVP Cryptographic Algorithm Validation Program
CCTL Common Criteria Testing Laboratory
CM Configuration Management
CMVP Cryptographic Module Validation Program
CSE Communications Security Establishment
CCCS Canadian Centre for Cyber Security
EAL Evaluation Assurance Level
ETR Evaluation Technical Report
GC Government of Canada
IT Information Technology
ITS Information Technology Security
PP Protection Profile
SFP Small Form-factor Pluggable
SFR Security Functional Requirement
ST Security Target
TOE Target of Evaluation
TSF TOE Security Function
8.2 REFERENCES
Reference
Common Criteria for Information Technology Security Evaluation, Version 3.1 Revision 5, April 2017.
Common Methodology for Information Technology Security Evaluation, CEM, Version 3.1 Revision 5, April 2017.
Security Target Sphyrna Security Unidirectional Gateway - Data Diode, 5 AUG 2021, v1.0
Evaluation Technical Report Sphyrna Security Unidirectional Gateway - Data Diode, 7 SEPT 2021, v1.2