122-B
UK IT SECURITY EVALUATION AND
CERTIFICATION SCHEME
COMMON CRITERIA CERTIFICATION REPORT No. P208A
Datacryptor 2000
Application Software Version 3.3
Issue 2.0
April 2005
© Crown Copyright 2005
Reproduction is authorised provided the report
is copied in its entirety
UK IT Security Evaluation and Certification Scheme, Certification Body,
CESG, Hubble Road, Cheltenham, GL51 0EX
United Kingdom
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Trademarks:
The following trademark is acknowledged:
Datacryptor is a registered trademark of Thales e-Security Ltd.
All other product or company names are used for identification purposes only and may be trademarks of their
respective owners.
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CERTIFICATION STATEMENT
Thales e-Security’s Datacryptor 2000 is a network encryption product that supports several
network protocols. It uses public key cryptography techniques to minimise the administrative
overhead of key management, and implements sophisticated measures to resist physical attack in
order to safeguard key material and algorithms.
Datacryptor 2000 Application Software Version 3.3 has been evaluated under the terms of the
UK IT Security Evaluation and Certification Scheme and has met the Common Criteria Part 3
conformant requirements of Evaluation Assurance Level EAL5 for the specified Common
Criteria Part 2 conformant functionality in the specified environment.
Originator CESG
Certifier
Approval and CESG
Authorisation Head of the Certification Body
UK IT Security Evaluation
and Certification Scheme
Date authorised 25 April 2005
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TABLE OF CONTENTS
CERTIFICATION STATEMENT.............................................................................................iii
TABLE OF CONTENTS..............................................................................................................v
ABBREVIATIONS.....................................................................................................................vii
REFERENCES.............................................................................................................................ix
I. EXECUTIVE SUMMARY.................................................................................................1
Introduction............................................................................................................................1
Evaluated Product..................................................................................................................1
TOE Scope .............................................................................................................................2
Protection Profile Conformance ............................................................................................4
Assurance...............................................................................................................................4
Strength of Function Claims ..................................................................................................4
Security Policy.......................................................................................................................4
Security Claims......................................................................................................................4
Evaluation Conduct...............................................................................................................5
General Points........................................................................................................................6
Note for HMG Consumers.....................................................................................................6
II. EVALUATION FINDINGS................................................................................................7
Introduction............................................................................................................................7
Delivery .................................................................................................................................7
Installation and Guidance Documentation.............................................................................8
Strength of Function ..............................................................................................................8
Vulnerability Analysis ...........................................................................................................9
III. EVALUATION OUTCOME............................................................................................11
Certification Result.............................................................................................................. 11
Recommendations................................................................................................................ 11
ANNEX A: EVALUATED CONFIGURATION.....................................................................13
ANNEX B: PRODUCT SECURITY ARCHITECTURE .......................................................15
ANNEX C: PRODUCT TESTING............................................................................................19
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ABBREVIATIONS
CA Certificate Authority
CAPS CESG Assisted Products Scheme
CC Common Criteria
CEM Common Evaluation Methodology
CLEF Commercial Evaluation Facility
DEK Data Encryption Key
EAL Evaluation Assurance Level
ETR Evaluation Technical Report
FIPS Federal Information Processing Standards
HMG Her Majesty’s Government
ITSEC Information Technology Security Evaluation Criteria
KEK Key Encryption Key
SFR Security Functional Requirement
SGSS Secure Generic Sub-System
SoF Strength of Function
TOE Target of Evaluation
UKSP United Kingdom Scheme Publication
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REFERENCES
a. DC2000 Security Target (Common Criteria),
Thales e-Security,
Ref 0562A218, Issue 00M, 5 April 2005.
b. Datacryptor 2000 Version Under Evaluation (Common Criteria),
Thales e-Security,
Ref 0562A226, Issue 00C, 12 January 2004.
c. Datacryptor 2000 Protocols Under Evaluation (Common Criteria),
Thales e-Security,
Ref 0562A227, Issue 00D, 28 January 2004.
d. Datacryptor 2000 Cryptographic Algorithms Under Evaluation (Common Criteria),
Thales e-Security,
Ref 0562A228, Issue 00B, 7 March 2003.
e. Datacryptor 2000 – Evaluation Assurance Level,
Thales e-Security,
Ref 0562A244, Version 00B, 2nd
April 2004.
f. Key Management Specification,
Racal-Airtech Ltd,
Ref 0550A109, Issue 00I, 17 March 2000.
g. Common Criteria Part 1,
Common Criteria Interpretations Management Board,
CCIMB-99-031, Version 2.1, August 1999.
h. Common Criteria Part 2,
Common Criteria Interpretations Management Board,
CCIMB-99-032, Version 2.1, August 1999.
i. Common Criteria Part 3,
Common Criteria Interpretations Management Board,
CCIMB-99-033, Version 2.1, August 1999.
j. Common Methodology for Information Technology Security Evaluation,
Part 2: Evaluation Methodology,
Common Criteria Evaluation Methodology Editorial Board,
Version 1.0, CEM-099/045, August 1999.
k. Description of the Scheme,
UK IT Security Evaluation and Certification Scheme,
UKSP 01, Issue 5.0, July 2002.
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l. CLEF Requirements - Startup and Operations,
UK IT Security Evaluation and Certification Scheme,
UKSP 02: Part I, Issue 4, April 2003.
m. CLEF Requirements - Conduct of an Evaluation,
UK IT Security Evaluation and Certification Scheme,
UKSP 02: Part II, Issue 1.0, October 2003.
n. DC2K EAL5 Evaluation Technical Report,
Logica CMG Security Group,
Ref 111407/T/5, Issue 1.0, July 2004
o. DC2000 Evaluated Configuration (Common Criteria),
Thales e-Security,
Ref 1270A377, Issue 00E, 2nd
August 2004.
p. Datacryptor 2000 Series Installation Guide,
Thales e-Security,
Ref 1270A274, Fifth edition, August 2001.
q. Datacryptor 2000 Series User Guide,
Thales e-Security,
Ref 1270A275, Fifth edition, August 2001.
r. Certification Report No. P126,
Datacryptor 2000 Application Version 1.01.2a using specified algorithms,
UK IT Security Evaluation and Certification Scheme,
Issue 1.0, July 1999.
s. FIPS PUB 140-1,
Security Requirements for Cryptographic Modules,
US Department of Commerce, National Institute of Standards and Technology,
11 January 1994.
t. FIPS PUB 180-1,
Secure Hash Sta ndard (SHS),
US Department of Commerce, National Institute of Standards and Technology,
April 1995.
u. FIPS PUB 186-2,
Digital Signature Standard (DSS),
US Department of Commerce, National Institute of Standards and Technology,
27 January 2000.
v. FIPS PUB 46-3,
Data Encryption Standard (DES),
US Department of Commerce, National Institute of Standards and Technology,
25 October 1999.
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w. Common Criteria Certification Report No. P208,
Datacryptor 2000 Application Software Version 3.3,
UK IT Security Evaluation and Certification Scheme,
Issue 1.0, September 2004.
x. Common Methodology for Information Technology Security Evaluation,
Evaluation Methodology for the Common Criteria for Information Technology Security
Evaluation,
Common Criteria Interpretations Management Board,
Version 1.2, CCIMB-2001/031, October 2001.
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I. EXECUTIVE SUMMARY
Introduction
1. This Certification Report states the outcome of the Common Criteria security evaluation of
Datacryptor 2000 Application Software Version 3.3 to the Sponsor, Thales e-Security, and is
intended to assist consumers when judging the suitability of the IT security of the product for
their particular requirements.
2. Consumers are advised to read this report in conjunction with the Security Target which
specifies the functional, environmental and assurance evaluation requirements. The Security
Target comprises both a main document [Reference a] and a series of supplementary documents
[b - f] which address specific aspects of the evaluated claims. When further referencing the
Security Target below, this Certification Report references the relevant document(s).
3. In particular, consumers should note that the scope of evaluation, as outlined below under
‘TOE Scope’, did not encompass the whole of the Datacryptor 2000 product.
Evaluated Product
4. The version of the product evaluated was:
Datacryptor 2000Application SoftwareVersion 3.3.
Datacryptor 2000 is sometimes described, in other documents, as DC2000 or as DC2K. The
evaluated subset of the product is also described in this report as the Target of Evaluation (TOE).
The Developer was Thales e-Security.
5. The Datacryptor 2000 product incorporates a Secure Generic Sub-System (SGSS).
a. Physically the SGSS is housed within an application unit, holds all components
relevant to the secure operation of the unit, encases these within a mesh and resin
covering, and protects them with alarm circuitry which erases the unit’s sensitive
contents on detecting any of a number of specified trigger conditions.
b. The SGSS provides cryptographic protection to securely load an application into a unit,
and provides a random number generator capability for use by the application. The
Datacryptor 2000 comprises both a physical unit, incorporating the SGSS, and
application code designed to run on the unit (note that alternative applications,
comprising code and unit hardware, can be engineered for use with SGSS).
6. Other primary Datacryptor 2000 product features are as follows:
a. The application in turn provides cryptographic protection to securely load
cryptographic algorithms and key material, which are then used to provide the
product’s network encryption functionality (between units loaded with compatible
algorithms and key material).
b. The product line can be used with a variety of algorithms, key material types and
communications protocols, suitable for a range of government and commercial use.
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c. Management software, running on a Management Centre PC, exists to commission and
configure a unit for use. Communication between the Management Centre and unit is
also encrypted.
7. Details of the evaluated configuration, including the TOE’s supporting guidance
documentation, are given in Annex A.
8. An overview of the product’s security architecture can be found in Annex B.
TOE Scope
9. Security functions were specified by the Security Target [a, f] in respect of the following
product functionality:
a. Random number generation by SGSS, and periodic, diagnostic, statistical testing of this
functionality.
b. Erasure by SGSS of sensitive content on detecting any of the following alarm
conditions:
• intrusion through the mesh and resin covering;
• transgression of high or low voltage thresholds;
• transgression of high or low temperature thresholds; and
• movement of the unit.
c. Cryptographic authentication of an application loaded intoSGSS.
d. Cryptographic authentication of each of the following loaded into Datacryptor 2000:
• Certificate Authorities(CA);
• Key exchange algorithm keysets;
• Key exchange algorithm ; and
• Encryption algorithm.
e. Establishment of a shared Key Encryption Key (KEK) by Datacryptor 2000.
f. Establishment of a shared Data Encryption Key (DEK) by Datacryptor 2000.
g. Encryption of network traffic by Datacryptor 2000.
10. The precise subset of this product functionality included in the TOE d
efined for evaluation
purposes is specified in the Security Target [a, f]. Significant points of this scoping are as
follows:
a. Only core components relating to this functionality were included (however
cryptographic algorithms were excluded, complementary Federal Information
Processing Standards (FIPS) and CESG Assisted Products Scheme (CAPS) results
being quoted as outlined in paragraph 20 below).
b. Only encryption of user traffic (and not management traffic) was included.
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c. The following were excluded:
i. Management Centre software (other than use of Element Manager
commissioning and configuration functionality used in accordance with the CC
evaluated configuration guide [o]);
ii. Some functionality providing interaction between the claimed security
functions, as specified in section 5.2.2 of the Security Target[a];
iii. Use of the communications ports (other than in respect of the cryptographic
protection given to user traffic, e.g. remote monitoring via the network port);
iv. Use of the unit’s front panel keyswitch and erase button;
v. Unit status indications given by the unit’s LEDs;
vi. Use of multiple user groups (communication within such a group being
authenticated by the group CA);
vii. Forced standby mode (requiring password authentication after power on of the
unit); and
viii. Hot standby functionality.
11. Whilst not subjected to EAL5 evaluation, some of the excluded product functionality listed
above was however used in testing the TOE, as outlined in Annex C below.
12. The CC evaluated configuration guide [o] assumes that the consumer takes delivery of a
Datacryptor 2000 unit with Datacryptor 2000 application and cryptographic algorithms pre-
loaded by the Developer. The functions to cryptographically authenticate an application loaded
into SGSS and algorithms loaded into Datacryptor 2000 effectively therefore give protection
against alternative applications or algorithms being loaded.
13. The TOE was evaluated for use of the product with the following cryptographic
algorithms, as claimed by the Security Target [d]:
a. Authentication DSA (FIPS PUB 186-2 [u])
with SHA-1 hashing (FIPS PUB 180-1 [t]).
b. Key Exchange Diffie Hellman (ANSI X9.42 Hybrid1, see [f] section 8.2)
with SHA-1 hashing (FIPS PUB 180-1 [t]).
c. Encryption Triple DES (FIPS PUB 46-3 [v]).
14. The TOE was evaluated for use of the product with the following communications
protocols, as claimed by the Security Target [c]:
a. IP (tunnelling encryption mode was used).
b. Frame Relay.
c. Link (framed).
d. Link (unframed).
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15. The following G.703 card options were used:
a. Frame Relay no G.703 card.
b. Link (framed) G.703 card (configured for E1 timeslots).
c. Link (unframed) no G.703 card.
Protection Profile Conformance
16. The Security Target [a] did not claim conformance to any protection profile.
Assurance
17. The Security Target [a, e] specified the assurance requirements for the evaluation.
Predefined evaluation assurance level EAL5 was used. Common Criteria Part 3 [i] describes the
scale of assurance given by predefined assurance levels EAL1 to EAL7. An overview of CC is
given in CC Part 1 [g].
18. Note that an EAL4 evaluation of the same product was performed concurrently with the
EAL5 evaluation. The Security Target [a, e] accordingly specified both EAL4 and EAL5
assurance requirements.
Strength of Function Claims
19. No minimum Strength of Function (SoF) was claimed as such a metric was not directly
relevant to the evaluated functionality.
20. The consumer is however advised that this CC certification is complemented by the
following evaluation results, which confirmed correct implementation of the product’s
cryptographic algorithms:
a. DSA FIPS certificates 24 and 104.
b. SHA-1 FIPS certificates 24 and 230.
c. Triple DES FIPS certificate 251.
d. Diffie Hellman CESG CAPS evaluation (of Application Software Version 3.13).
Security Policy
21. The product security policy is evident from the Security Target [a, d, f]. This includes use
of the publicly known cryptographic algorithms specified in paragraph 13 above.
Security Claims
22. The Security Target [a, f] fully specifies the TOE’s security objectives, the threats which
these objectives counter and security functional requirements (SFRs) and security functions to
elaborate the objectives. All of the SFRs are taken from CC Part 2 [h]; use of this standard
facilitates comparison with other evaluated products.
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23. Note that a triggering condition of sufficient degree is required to trigger the various
alarms for which security functionality is claimed by section 9.1.3.2 of the Security Target[a],
e.g. temperature sensors do not respond immediately to changes in ambient temperature.
Evaluation Conduct
24. The evaluation was carried out in accordance with the requirements of the UK IT Security
Evaluation and Certification Scheme as described in United Kingdom Scheme Publication 01
(UKSP 01) and UKSP 02 [k -m]. The Scheme has established a Certification Body which is
managed by CESG on behalf of Her Majesty’s Government. .
25. The purpose of the evaluation was to provide assurance about the effectiveness of the TOE
in meeting its Security Target [a - f], whic h consumers are advised to read. To ensure that the
Security Target gave an appropriate baseline for a CC evaluation, it was first itself evaluated, in
accordance with CC Part 3 [i], the Common Evaluation Methodology (CEM)[j] and relevant
interpretations. The TOE was then evaluated against this baseline. The working draft [x] of an
international CC project update to CEM was used as a basis for interpreting and applying the
EAL5 assurance requirements.
26. As noted in paragraph 18 above, an EAL4 evaluation [w] was performed concurrently with
this evaluation. The Evaluators combined the activities for the respective evaluations wherever
this was valid for the EAL4 and EAL5 requirements.
27. The TOE security functionality and security environment, together with much of the
supporting evaluation deliverables, remained similar to or unchanged from that of Datacryptor
2000 Application Version 1.01.2a, which had previously been certified by the IT Security
Evaluation and Certification Scheme to the ITSEC E3 assurance level [r]. For the evaluation of
Datacryptor 2000 Application Version 3.3, the Evaluators addressed every CC Part 3 [i] EAL5
criterion but made some use of Datacryptor 2000 Application Version 1.01.2a evaluation results
where these were valid for both Datacryptor 2000 Application Version 3.3 and the EAL5
requirements.
28. Developer test evidence for the claimed alarm functionality was that previously supplied as
input to a CAPS evaluation of Datacryptor 2000 Application Version 3.13. The Evaluators first
checked the validity of this Developer test evidence by confirming that the specification of alarm
circuitry and sensors was sufficiently precise and unchanged from that version of the product.
29. Complementary FIPS and CAPS results for cryptographic algorithms, quoted above in
paragraph 20, exist for Datacryptor 2000 Application Software Versions 3.1, 3.13 and 3.41. To
confirm the validity of these results for Datacryptor 2000 Application Software Version 3.3 the
Evaluators checked configuration management records and compared source code to confirm
that the implementation of the algorithms excluded from the scope of the TOE by the Security
Target [a] exhibited no significant differences.
30. The Certification Body monitored the evaluation which was carried out by the LogicaCMG
Commercial Evaluation Facility (CLEF). The evaluation was completed when the CLEF
submitted the Evaluation Technical Report (ETR) [n] to the Certification Body in July 2004. The
Certification Body then produced issue 1.0 of this Certification Report. Issue 2.0 merely caters
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for a change in the SGSS acronym definition, in both this Certification Report and the Security
Target.
31. Annex D of the ETR [n] references a number of Activity Reports for each of the various
CC Part 3 [i] assurance classes. Within this Certification Report, these activity reports are
regarded as being part of the ETR.
General Points
32. The evaluation addressed the security functionality claimed in the Security Target [a, f]
with reference to the assumed operating environment specified by the Security Target. The
evaluated configuration was that specified in Annex A. Consumers are advised to check that this
matches their identified requirements and to give due consideration to the recommendations and
caveats of this report.
33. Certification is not a guarantee of freedom from security vulnerabilities; there remains a
small probability (smaller with greater assurance) that exploitable vulnerabilities may be
discovered after a certificate has been awarded. This Certification Report reflects the
Certification Body’s view at the time of certification. Consumers should check regularly for
themselves whether any security vulnerabilities have been discovered since this report was
issued and, if appropriate, should check with the Vendor to see if any patches exist for the
product and what assurance exists for such patches.
34. The issue of a Certification Report is not an endorsement of a product.
Note for HMG Consumers
35. The Developer has submitted certain versions of Datacryptor 2000 for CESG
cryptographic evaluations (formerly known as CAPS evaluations). These are distinct from CC
evaluations, and are required to give assurance where cryptographic protection is to be given to
protectively marked UK government data. HMG consumers wishing to check on versions of the
product evaluated to these standards are advised to check the CESG web site at
www.cesg.gov.uk.
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II. EVALUATION FINDINGS
Introduction
36. The evaluation addressed the requirements specified in the Security Target [a - f]. The
results of this work were reported in the ETR [n] under the CC Part 3 [i] headings. The following
sections note considerations that are of particular relevance to the consumer.
Delivery
37. On receipt of the TOE, the consumer is recommended to check that the evaluated version
has been supplied, and to check that the security of the TOE has not been compromised in
delivery.
38. The following delivery items exist for the TOE:
a. The Datacryptor 2000 product, comprising Datacryptor 2000 units (with pre-loaded
Datacryptor 2000 application software and algorithms) and the ‘Backup’ CD (holding
backup Datacryptor 2000 application software and algorithms, Management Centre
software and the installation and user guides [p, q]), is despatched to the consumer in
response to an order.
b. The Security Target [a - f] and CC evaluated configuration guide [o] are o
btainable
from the Developer on a need to know basis.
39. The following measures provide for secure delivery of the Datacryptor 2000 product:
a. An Order Acknowledgement, sent on company stationery using normal mail, is sent to
the consumer. This details the type and quantity of product ordered and the expected
delivery date.
b. Each unit is individually shrink wrapped
. A number of shrink wrapped units, together
with a copy of the ‘Backup’ CD, are packed in a carton, each of which is itself sealed.
c. Cartons are delivered to the consumer using anapproved courier. The Consumer may
specify their own courier, or ask to be informed of the Courier selected by the
Developer,if they so desire.
d. A delivery note attached to each carton matches the previously despatched Order
Acknowledgement.
e. Each unit is designed to detect tampering and render itself unusable if tampering
occurs.
40. The following provide for identification of the delivered product:
a. The ‘Backup’ CD is clearly marked as applying to Datacryptor 2000 Application
Software Version 3.3.
b. Once loaded onto a Management Centre, the Management Centre software identifies
itself as part of a Datacryptor 2000 Application Version 3.3 product set.
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c. The Security Target [b] also specifies identifiers for the hardware of the units. These
are marked on the base of the unit and relate to the protocol variants as follows:
• 1600A321 Link (unframed) or Frame Relay;
• 1600B321 Link (framed); and
• 1600E321 IP.
41. The following MD5 hash values can be used to authenticate the component documents of
the evaluated Security Target:
• Main Security Target document [a] ee78b6b8d78be3007689271c80520f14
• Version under evaluation [b] 7b9e563f841da0e7a0812a39e0fc48db
• Protocols under Evaluation [c] 387b3d3ecd19fd6948b5ebf16960341d
• Algorithms under evaluation [d] f3440c5b5ccefe48dd4589099b91ad42
• Evaluation assurance level [e] a8dfa911c4e270091b2fac83abc3ea6d
• Key management specification [f] 186bd7c779ea1adb8c1ca1226bb21a73
Installation and Guidance Documentation
42. The installation and user guides [p, q] provide a variety of information relevant to the
operation and use of the unit, including information relating to security and general
communication settings. The CC evaluated configuration guide [o] lists the security settings
which should be made to establish the evaluated configuration of the TOE, by referencing the
appropriate sections of the installation and user guides.
43. In addition Appendix A of the installation guide is of note in that it contains useful
information concerning the various unit status LEDs, some indicating alarms triggered by alarm
functionality within the evaluated TOE. (Sections 4.2 and 4.3 of the installation guide contain
useful descriptions of the various alarm functions themselves).
44. The Evaluators drew particular attention to the need to ensure that an encrypt mode is set
for each connection; i.e. to ensure that traffic is encrypted and not passed as plaintext.
45. Note that for evaluation purposes, as in the evaluated configuration guide [o], key material
signed by a Developer CA was used. By contrast the usual recommendation is to use key
material signed by an alternative CA. Strictly the installation process to load the certificate of an
alternative CA was thus not followed when installing the evaluated TOE; however the
authentication mechanism then called is understood to be identical to that used to authenticate
the Developer CA, and the risk of unexpected effects if using key material signed by an
alternative CA is considered low.
Strength of Function
46. Based on their examination of the evaluation deliverables, the Evaluators confirmed that
there were no probabilistic or permutational mechanisms in the TOE warranting a SoF claim.
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47. With regard to the checks outlined in paragraph 29 above, the Evaluators confirmed that
the implementations of the cryptographic algorithms in the Datacryptor 2000 Software
Application Version 3.3 product exhibited no significant differences from those for which
complementary FIPS and CAPS results are quoted.
Vulnerability Analysis
48. The Evaluators’ vulnerability analysis was based on visibility of the TOE given by the
evaluation process, a general awareness of the functionality of the overall product and its
associated management software, and public domain vulnerability sources.
49. The Evaluators found no potential vulnerability for which exploitability was related to the
protected asset value of £500,000 claimed by section 6.1.2 of the Security Target [a]. No
exploitable or residual vulnerabilities were identified during the overall course of vulnerability
analysis and penetration testing.
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III. EVALUATION OUTCOME
Certification Result
50. After due consideration of the ETR [n], produced by the Evaluators, and the conduct of the
evaluation, as witnessed by the Certifier, the Certification Body has determined that Datacryptor
2000 Application Software Version 3.3 meets the Common Criteria Part 3 conformant
requirements of Evaluation Assurance Level EAL5 for the specified Common Criteria Part 2
conformant functionality in the specified environment
Recommendations
51. Consumers of Datacryptor 2000 Application Software Version 3.3 should understand the
specific scope of the certification by reading this report in conjunction with the Security Target
[a - f]. The TOE should be used in accordance with a number of environmental considerations as
specified in the Security Target.
52. Only the evaluated TOE configuration should be installed. This is specified in Annex A
with further relevant information given above under ‘TOE Scope’ and ‘Evaluation Findings’.
53. The TOE should be used in accordance with the supporting guidance documentation
included in the evaluated configuration.
54. The above ‘Evaluation Findings’ include a number of recommendations relating to the
secure receipt, installation, configuration and operation of the TOE.
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Datacryptor 2000 EAL5
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ANNEX A: EVALUATED CONFIGURATION
TOE Identification
1. The TOE consists of selected components of:
Datacryptor 2000 Application Software Version 3.3.
2. The TOE comprises a Datacryptor 2000 application unit, with pre-loaded application
software and algorithms. Protocol variant dependent hardware identifiers, marked on the base of
the units, are:
• 1600A321 Link (unframed) or Frame Relay.
• 1600B321 Link (framed).
• 1600E321 IP.
3. The supporting guidance documents evaluated were:
a. DC2000 Evaluated Configuration (Common Criteria) [o],
1270A377.00E, 2nd
August 2004.
b. Datacryptor 2000 Series Installation Guide [p],
1270A274-005, August 2001.
c. Datacryptor 2000 User Installation Guide [q];
1270A275-005, August 2001.
4. Further discussion of the supporting guidance material is given above under ‘Installation
and Guidance Documentation’.
5. A backup CD, marked as applying to Datacryptor 2000 Application Sofware Version 3.3,
holds backup Datacryptor 2000 application software and algorithms, Management Centre
software, and installation and user guides [p, q].
TOE Configuration
6. The product configuration used for testing was in accordance with the CC evaluated
configuration guide [o]. Some test versions of the Datacryptor 2000 application code were used,
as outlined below in Annex C.
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Datacryptor 2000 EAL5
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ANNEX B: PRODUCT SECURITY ARCHITECTURE
1. This annex gives an overview of product architectural features that are relevant to its
security. Details of the scope of the evaluation are given in various sections above.
Physical Product Architecture
2. The SGSS incorporates the following components:
a. A Motorola Coldfire CPU.
b. Further processing components handling encryption and decryption.
c. Flash memory, from where code is loaded into processing components and other
memory areas on unit reset or power-up.
d. Battery-backed RAM holding code and data that is persistent over a unit reset or
power-down.
e. RAM holding code and data that is non-persistent over a unit reset or power-down.
f. Sensors for the following alarm conditions :
• intrusion through the mesh and resin covering (in which the SGSS is encased);
• transgression of high or low voltage thresholds;
• transgression of high or low temperature thresholds; and
• movement of the unit.
g. Alarm circuitry which causes erasure of the contents of the encryption/decryption
processing components and both persistent and non-persistent RAM on transgression
of any of the alarm conditions.
h. A random number generator capability.
3. The Datacryptor 2000 unit incorporates the following components in addition to those of
the SGSS:
a. Further processing components handling communications.
b. G703 or IP card, in accordance with the following options:
• IP: IP card required;
• Frame Relay: G703 card optional (configured to use selected E1 or T1
timeslots);
• Link (framed) : G703 card required (configured to use selected E1 or T1
timeslots); and
• Link (unframed) : G703 card optional (configured to use all E1 or T1 timeslots).
c. Host and network ports (these are provided on the motherboard; however those on an
IP or G.703 card are used if such a card is installed).
d. Ethernet and serial management ports.
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e. Front panel keyswitch(for setting alarms).
f. Unit status indicator LEDs.
g. Front panel erase button.
h. Tamper evident external casing.
4. The Datacryptor 2000 unit is used in conjunction with a Management Centre, which may
take the following forms:
a. Image Load Application: A PC-based application, usually used in the factory, to load
SGSS and Datacryptor 2000 application software.
b. Element Manager: A PC-based Datacryptor 2000 management application,
incorporating the ‘Front Panel View’ G
UI. It may be used to manage one or more
locally connected Datacryptor 2000 units, or a remote unit via a locally connected unit.
Communication between the Element Manager and Datacryptor 2000 u
nit is usually
encrypted using broadly similar cryptographic mechanisms to those used to protect the
data traffic passed between a pair of units; where a unit is managed remotely then the
management commands are passed as encrypted traffic between the local and remote
units’ network ports.
c. Crypto Manager: A unit, broadly equivalent to a Datacryptor 2000 unit, which is
physically separate from the Element Manager but connected to it and providing
encryption/decryption of management traffic with Datacryptor 2000 units on its behalf.
d. A general-purpose SNMP-based network management node may be used to
communicate with a Datacryptor 2000 unit for the purpose of remotely viewing non
TOE Security Policy enforcing communications settings.
Logical Product Architecture
5. SGSS software, which is loaded into flash memory in the factory, comprises bootstrap
functions and a means of loading Datacryptor 2000 application code into the unit. The
application code is concatenated with a digital signature, generated using the Developer’s private
key; this signature is then used to authenticate the application on loading into SGSS, using the
Developer’s public key embedded in the SGSS software.
6. The cryptographic architecture of the Datacryptor 2000 application is as follows:
a. A choice of publicly known and more sensitive algorithms is available for use with the
Datacryptor 2000 application, for both key exchange and encryption. The Datacryptor
2000 application authenticates each algorithm when it is loaded into the unit using the
public key held by the Datacryptor 2000 application.
Note that:
• For sensitive algorithms a pair of signatures can be used, one generated by the
Developer and another by an appropriate CA; otherwise only Developer
signatures are used.
b. Each unit needs to possess a keyset which can be verifiedby a common CA. The CA
must first be authenticated when its certificate is loaded into the unit using the CA’s
Datacryptor 2000 EAL5
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public key held by the Datacryptor 2000 application. The keyset must also be
authenticated on loading using the CA’s public key.
Note that:
• the precise nature of the keyset depends on the key exchange algorithm used (e.g.
Diffie-Hellman parameters p and g are used in the formulation of a keyset).
• A Developer CA is used initially; however the option exists to then install an
alternative CA.
• A set of units operating under a common CA constitute a ‘user group’. A given
unit can be a member of multiple user groups if multiple CAs are installed.
c. To establish secure communication between a pair of units, the units first confirm that
they are operating under a common CA by exchanging key certificates signed by the
CA and authenticating each other. The key exchange algorithm is then used to establish
a common KEK between the units. To derive a unique KEK, each u
nit uses both its
signed keyset and a one-time keyset generated using the SGSS random number
generator.
Note that:
• As an alternative to use of a key exchange algorithm, ‘red’ KEKs may be installed
into a unit.
d. Each unit then generates random data using the SGSS random number generator, and
exchanges this data with its peer. Each unit then uses this data, the KEK and the
encryption algorithm to derive a transmit-receive pair of common DEKs.
e. Each unit uses the DEKs and encryption algorithm to encrypt and decrypt the actual
data traffic being passed.
f. Encryption of data traffic is critically dependent on the mode for the connection
between the pair of units being set to encrypt; otherwise the traffic may be passed as
plaintext (if not discarded).
7. The Datacryptor 2000 application also includes functionality to:
a. support a unit’s external communications for data and management traffic, in
accordance with the relevant protocols.
b. operate the unit LEDs.
c. execute management commands received from a Management Centre and return any
responses.
d. invoke periodic operations including:
• establishment of new keys on key expiry; and
• background diagnostic statistical checking of the SGSS random number generator
every 10 minutes, failure of which causes the unit to cease data transmission.
e. restart the application on power-up (where the option of forced standby mode is
employed, this includes blocking the transmission and receipt of host and network port
traffic until a valid user password is supplied).
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f. support the option of hot standby mode, in which a pair of Datacryptor 2000 units
operate as master and standby.
8. The Datacryptor 2000 product suite also includes Management Centre software.
Evaluated Design Subsystems
9. The evaluated design subsystems correspondedto the subsections of sections 9.1.2 to 9.1.6
of the Security Target [a]. The role of each subsystem was that implied by the security functions
specified in these subsections of the Security Target, together with the product architecture and
TOE scope specified above.
Datacryptor 2000 EAL5
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April 2005 Issue2 .0 Page 19
ANNEX C: PRODUCT TESTING
IT Product Testing
1. The Developer performed testing of the claimed security functions. Supporting analyses
demonstrated coverage of the various TOE design components, inputs and outputs, together with
the associated effects and exceptions.
2. The Evaluators witnessed a sample of Developer testing and repeated a further sample of
Developer tests; approximately one third of the Developer testing was either witnessed or
repeated. The Evaluators als o formulated and performed additional functional tests and
penetration tests.
3. As the TOE comprised only a subset of core product components, it was tested through
testing the product itself. Similarly the Evaluators used the visibility which they had of the
overall product, e.g. that given by the guidance documentation [p, q], when performing
independent vulnerability analysis and formulating penetration tests for the TOE itself. Thus a
range of product functionality excluded from the TOE was exercised in the course of testing,
including that:
a. implementing cryptographic algorithms.
b. associated with use of the communication ports (e.g. the unit’s SNMP agent).
c. associated wit h the unit’s LEDs.
d. providing interaction between the claimed security functions.
e. running on the Management Centre.
4. To stimulate the desired set of effects and exceptions, a number of test versions of the
Datacryptor 2000 software application were used, each of which included a variation from the
standard software application engineered to produce the desired behaviours. Such behaviours
included:
a. Forcing exceptions (e.g. non-random output from the random number generation
functionality).
b. Dumping test output data to devices external to the product.
5. A number of test utilities were used, some developed for test purposes, to analyse the data
generated in the course of testing. Such utilities included those which:
a. Invoked the loading of applications into SGSS.
b. Checked generated key material and encrypted data traffic.
c. Checked the randomness of sequences of random numbers generated (to ensure that
the TOE passed the random number generator tests specified in FIPS PUB 140-1 [s]).
6. The Eva luators were satisfied that the software developed for test purposes was appropriate
for producing the intended behaviours.
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7. A range of test equipment was used in conjunction with the units under test, including:
a. PCs used to exercise the units under test.
b. A PC used to record line traces of traffic passed between two units.
c. A PC used to host an SNMP network manager product.
d. That needed to test alarm conditions (e.g. heating and cooling equipment and a
thermometer).
Protocol Variant Testing
8. The Evaluators were satisfied that sufficient testing was performed for the four
communications protocol variants of the product:
a. Where necessary testing was repeated on all protocol variants.
b. When repeating tests which the Developer had performed only on certain protocol
variants, the Evaluators repeated the tests on other protocol variants.
c. Otherwise it was demonstrated by analysis that the behaviour being tested was not
sensitive to the protocol variations.