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Security Policy
No: 010-107949-01 Rev: 3
REVISION # ECO # REVISION # ECO #
1 18-2103 3 19-0509
2 18-3663
Title: Christie IMB-S3 4K Integrated Media Block
(IMB) Security Policy
Product(s): Christie IMB-S3 4K Integrated
Media Block (IMB)
Prepared by: Kevin Draper
Prep’d Date:
Last Updated:
05/11/2017
02/05/2019
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Detailed Revision History
Revision Description of Changes Date
1 Initial Public Release 05/11/2018
2 Updated for firmware versions 2.1.5-4575 & 2.1.5-4582 10/03/2018
3 Updates to clarify security details 02/05/2019
This document may only be reproduced in its entirety without revision including this statement.
Copyright ©2019 Christie Digital Systems Canada Inc.
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Table of Contents
1. SCOPE.............................................................................................................................................................................5
1.1 REFERENCE DOCUMENTS........................................................................................................................................5
2. PRODUCT OVERVIEW...............................................................................................................................................5
2.1 VALIDATED MODULE VERSIONS.............................................................................................................................5
3. SECURITY LEVELS.....................................................................................................................................................6
4. MODES OF OPERATION............................................................................................................................................7
5. CRYPTOGRAPHIC BOUNDARY ..............................................................................................................................7
6. BLOCK DIAGRAM.....................................................................................................................................................10
7. APPROVED ALGORITHMS.....................................................................................................................................11
8. NON-APPROVED ALGORITHMS...........................................................................................................................12
9. PORTS AND INTERFACES.......................................................................................................................................13
10. AUTHENTICATION...............................................................................................................................................13
11. ROLES AND SERVICES........................................................................................................................................14
11.1 CRYPTO OFFICER SERVICES..................................................................................................................................14
11.2 USER SERVICES.....................................................................................................................................................14
11.3 UNAUTHENTICATED SERVICES..............................................................................................................................14
11.4 NON-APPROVED SERVICES ....................................................................................................................................15
12. CRITICAL SECURITY PARMETERS & PUBLIC KEYS ................................................................................18
12.1 CRITICAL SECURITY PARAMETERS (CSPS) ...........................................................................................................18
12.2 PUBLIC KEYS ........................................................................................................................................................18
13. PHYSICAL SECURITY..........................................................................................................................................19
14. OPERATIONAL ENVIRONMENT ......................................................................................................................20
15. SELF-TESTS............................................................................................................................................................20
16. MITIGATION OF OTHER ATTACKS................................................................................................................20
17. SECURITY RULES.................................................................................................................................................21
18. ACRONYMS ............................................................................................................................................................22
19. APPENDIX A: CRITICAL SECURITY PARAMETERS...................................................................................23
20. APPENDIX B: PUBLIC KEYS ..............................................................................................................................23
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Table of Figures
Figure 1 Front view of Christie IMB-S3 ________________________________________________________ 7
Figure 2 Top View of Christie IMB-S3 _________________________________________________________ 8
Figure 3 Bottom View of Christie IMB-S3_______________________________________________________ 9
Figure 4 Module Block Diagram ____________________________________________________________ 10
List of Tables
Table 1 Reference Documents ________________________________________________________________ 5
Table 2 Validated module versions____________________________________________________________ 5
Table 3 FIPS 140-2 Security Levels ___________________________________________________________ 6
Table 4 FIPS Approved Algorithms __________________________________________________________ 11
Table 5 Non-Approved Algorithms ___________________________________________________________ 12
Table 6 Ports and Interfaces________________________________________________________________ 13
Table 7 Roles and Required Identification and Authentication _____________________________________ 13
Table 8 Strength of Authentication Mechanism __________________________________________________ 13
Table 9 Crypto Officer Services______________________________________________________________ 14
Table 10 User Services_____________________________________________________________________ 14
Table 11 Unauthenticated Services ___________________________________________________________ 14
Table 12 Non-Approved Services_____________________________________________________________ 17
Table 13 Public Keys _____________________________________________________________________ 18
Table 14 Inspection/Testing of Physical Security Mechanisms _____________________________________ 19
Table 15 Mitigation of Other Attacks _________________________________________________________ 20
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1. SCOPE
This document is the Cryptographic Module Security Policy for the Christie IMB-S3 4K Integrated Media
Block (IMB) (also referred to herein as the Christie IMB-S3, the cryptographic module, or simply the module).
This policy is a specification of the security rules under which the Christie IMB-S3 operates and meets the
requirements of FIPS 140-2 Level 2.
1.1 REFERENCE DOCUMENTS
Document No. Description
FIPS PUB 140-2 Security Requirements For Cryptographic Modules [FIPS PUB 140-2]
(http://csrc.nist.gov/publications/fips/fips140-2/fips1402.pdf )
Table 1 Reference Documents
2. PRODUCT OVERVIEW
The Christie IMB-S3 is a multi-chip embedded cryptographic module. In the FIPS Approved mode of
operation, the module only provides the “Upgrade” service.
In the non-Approved mode of operation the module is a DCI-compliant integrated media block solution to
enable the playback of the video, audio and timed text essence on a Christie “Fusion” Series 3 digital cinema
projector (2K or 4K projector). The IMB-S3 enables playback of encrypted cinema content packaged as an
industry standard Digital Cinema Package (DCP). The IMB-S3 supports playback of digital cinema content
from a network attached storage (NAS) device.
2.1 VALIDATED MODULE VERSIONS
The validated module consists of the following:
Hardware version Firmware version
000-105081-03 2.1.5-4575
000-105081-03 2.1.5-4582
Table 2 Validated module versions
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3. SECURITY LEVELS
The IMB is tested to meet the FIPS security requirements shown in Table 3.
FIPS 140-2 Security Requirements Security Level
1. Cryptographic Module Specification 2
2. Cryptographic Module Ports and Interfaces 2
3. Roles, Services and Authentication 3
4. Finite State Model 2
5. Physical Security 3
6. Operational Environment N/A
7. Cryptographic Key Management 2
8. EMI/EMC 2
9. Self-Tests 2
10. Design Assurance 3
11. Mitigation of Other Attacks N/A
FIPS Overall Level 2
Table 3 FIPS 140-2 Security Levels
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4. MODES OF OPERATION
The Christie IMB-S3 provides a FIPS Approved mode of operation and a non-Approved mode of operation.
To determine that the module is running in a FIPS Approved mode of operation, the operator shall verify the
FIPS LED status:
o Orange – module is running power-up self-tests.
o Green – module has successfully performed self-tests and is running in FIPS mode.
o Red – module has entered an error state; all cryptographic operations are inhibited.
In the FIPS Approved mode of operation, the module only provides the “Upgrade” service. The module is in
the non-Approved mode of operation whenever any of the disallowed services in Section 11.4, Table 12 Non-
Approved Services, are invoked.
5. CRYPTOGRAPHIC BOUNDARY
The illustrations below indicate the cryptographic boundary and the physical ports defined on the boundary.
The cryptographic boundary is the outer physical perimeter of the module’s PCB board; the effective security
boundary is the physical perimeter of the module’s metal Security Enclosure.
Everything outside the metal Security Enclosure is excluded from FIPS 140-2 Requirements. Unlabelled
connectors are not interfaces on the cryptographic boundary.
Figure 1 Front view of Christie IMB-S3
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Figure 2 Top View of Christie IMB-S3
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Figure 3 Bottom View of Christie IMB-S3
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6. BLOCK DIAGRAM
Decryptor/Decoder FPGA
Security Manager FPGA
Audio
Aurora Video Port
LVDS Video Port
(latent – reserved for
future use)
Ethernet
Projector I/O
PCIE
LPC (latent – reserved
for future use)
Audio
Security
Boundary
Data Input
Data Output
Control Input
Status Output
Ethernet
Power
Reset
Power Good
LEDs
Figure 4 Module Block Diagram
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7. APPROVED ALGORITHMS
The cryptographic module only supports the following Approved algorithms in the FIPS Approved mode of
operation:
CAVP
Cert
Algorithm Standard Mode/Method Key Lengths,
Curves or Moduli
Use
1062 RSA FIPS 186-2 PKCS1.5 with
SHA-256
2048 Digital Signature
Verification
1788 SHS FIPS 180-4 SHA-256 N/A Message Digest
Note: CAVP certificates contain many other algorithms/modes that are not supported by the Module in the
FIPS Approved Mode
Table 4 FIPS Approved Algorithms
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8. NON-APPROVED ALGORITHMS
The cryptographic module supports the following non-Approved algorithms in the non-Approved mode of
operation:
Algorithm Use
AES-128-CBC (non-compliant) Encryption / Decryption
AES-128-ECB (non-compliant) Encryption / Decryption
ANSI X9.31 DRNG Random Number Generation
FIPS 186-2 DRNG Random Number Generation
HMAC-SHA-1 (non-compliant) Message Authentication
MD5 Message digest in TLS 1.0 / 1.1
NDRNG Seeding for the DRNG
RSA 2048 (non-compliant) Digital Signature Generation: RSA-2048 with SHA-1 and
RSA-2048 with SHA-256;
Digital Signature Verification: RSA-2048 with SHA-1;
RSA-2048 Decryption
SP800-135 TLS v1.0 KDF (non-compliant) TLS 1.0 / 1.1 Key derivation
SHA-1 (non-compliant) Message Digest
TI ECDH Considered as non-security relevant data obfuscation
(plaintext) and only used to interoperate with legacy
equipment
Table 5 Non-Approved Algorithms
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9. PORTS AND INTERFACES
The following table maps the logical interfaces to the physical ports:
Logical Interface Physical Ports
Data Input Ethernet, Audio, LVDS Video Port (latent – reserved for future use)
Data Output Ethernet, Audio, Aurora Video Port
Control Input Ethernet, Projector I/O, PCIE, LPC (latent – reserved for future use), Reset, Power Good
Status Output Ethernet, Projector I/O, PCIE, LPC (latent – reserved for future use), LEDs
Power Power
Table 6 Ports and Interfaces
10. AUTHENTICATION
The Christie IMB-S3 shall support the following distinct operator roles: Crypto Officer and User.The Christie
IMB-S3 does not support a Maintenance role. The cryptographic module shall enforce the separation of roles
using identity-based operator identification.
Role Type of Authentication Authentication Data
Crypto Officer Identity-based operator authentication RSA Digital Signature Verification
User Identity-based operator authentication RSA Digital Signature Verification
Note: See Table 4 for applicable Modes and Key Lengths
Table 7 Roles and Required Identification and Authentication
Authentication Mechanism Strength of Mechanism
RSA Digital Signature Verification The authentication is based on RSA 2048 which provides an equivalent
encryption strength of 112 bits. The probability that a random attempt
will succeed or a false acceptance will occur is 1/2112
which is less than
1/1,000,000.
There is a 1 second retry delay after each attempt which limits the
number of attempts that can be launched per minute. The probability
that a random attempt will successfully authenticate to the module
within one minute is 60/2112
which is less than 1/100,000.
Table 8 Strength of Authentication Mechanism
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11. ROLES AND SERVICES
11.1 CRYPTO OFFICER SERVICES
Table 9 summarizes the services that are available to the Crypto Officer role.
Services Description Public Key(s) Type(s) of Access
Upgrade Update the firmware via
RSA signature
verification
Christie Root CA Key,
Certificate Chain, Christie
Firmware Update Key
Read
Table 9 Crypto Officer Services
11.2 USER SERVICES
Table 10 summarizes the services that are available to the User role.
Services Description Public Key(s) Type(s) of Access
Upgrade Update the firmware via
RSA signature
verification
Christie Root CA Key,
Certificate Chain, Christie
Firmware Update Key
Read
Table 10 User Services
11.3 UNAUTHENTICATED SERVICES
Table 11 summarizes the unauthenticated services that are available to the module. The services are implicitly
allocated to each authorized role, since both the Crypto Officer and User can invoke Power On Self-Tests by
power-cycling the module and similarly observe Status output via the LEDs.
Services Description Public Key(s) Type(s) of Access
Power On Self-Tests Self-tests performed at
Power On
N/A N/A
Status Status Output N/A N/A
Table 11 Unauthenticated Services
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11.4 NON-APPROVED SERVICES
The following services are supported only in the non-Approved mode of operation:
Roles Services Description Non-Approved
Algorithms
Crypto Officer/
User
Projector Status Monitor Projector status TI-ECDH
Crypto Officer/
User
Zeroization Zeroizes keys used in the
non-Approved mode of
Operation
N/A
Crypto Officer/
User
System Management System Management
functions for the module
ANSI X9.31 DRNG
NDRNG
MD5
RSA 2048 (non-compliant)
AES-128-CBC (non-compliant)
HMAC-SHA-1 (non-compliant)
SHA-1 (non-compliant)
SP800-135 TLS v1.0 KDF (non-
Compliant)
Crypto Officer/
User
Digital Cinema
Authentication
Authenticate Digital
Cinema
ANSI X9.31 DRNG
NDRNG
MD5
RSA 2048 (non-compliant)
AES-128-CBC (non-compliant)
HMAC-SHA-1 (non-compliant)
SHA-1 (non-compliant)
SP800-135 TLS v1.0 KDF (non-
Compliant)
Crypto Officer/
User
KDM Management Service for managing
KDM information
MD5
HMAC-SHA-1 (non-compliant)
SHA-1 (non-compliant)
SP800-135 TLS v1.0 KDF (non-
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Compliant)
RSA 2048 (non-compliant)
AES-128-CBC (non-compliant)
AES-128-ECB (non-compliant)
ANSI X9.31 DRNG
FIPS 186-2 DRNG
NDRNG
Crypto Officer/
User
CPL Management Service for managing
CPL information
ANSI X9.31 DRNG
NDRNG
MD5
RSA 2048 (non-compliant)
AES-128-CBC (non-compliant)
HMAC-SHA-1 (non-compliant)
SHA-1 (non-compliant)
SP800-135 TLS v1.0 KDF (non-
Compliant)
Crypto Officer/
User
Encrypted Playback Service for decrypting
encrypted content
ANSI X9.31 DRNG
NDRNG
MD5
RSA 2048 (non-compliant)
AES-128-CBC (non-compliant)
HMAC-SHA-1 (non-compliant)
SHA-1 (non-compliant)
SP800-135 TLS v1.0 KDF (non-
Compliant)
Crypto Officer/
User
Log Management Service for retrieving log
data
ANSI X9.31 DRNG
NDRNG
MD5
RSA 2048 (non-compliant)
AES-128-CBC (non-compliant)
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HMAC-SHA-1 (non-compliant)
SHA-1 (non-compliant)
SP800-135 TLS v1.0 KDF (non-
Compliant)
Crypto Officer/
User
Suite Management Initiate, monitor and
manage projector suite
ANSI X9.31 DRNG
NDRNG
MD5
RSA 2048 (non-compliant)
AES-128-CBC (non-compliant)
HMAC-SHA-1 (non-compliant)
SHA-1 (non-compliant)
SP800-135 TLS v1.0 KDF (non-
Compliant)
Crypto Officer/
User
Marriage Verification Verify projector marriage ANSI X9.31 DRNG
NDRNG
MD5
RSA 2048 (non-compliant)
AES-128-CBC (non-compliant)
HMAC-SHA-1 (non-compliant)
SHA-1 (non-compliant)
SP800-135 TLS v1.0 KDF (non-
Compliant)
Table 12 Non-Approved Services
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12. CRITICAL SECURITY PARMETERS & PUBLIC KEYS
12.1 CRITICAL SECURITY PARAMETERS (CSPS)
The module does not contain secret, private keys and/or CSPs in the Approved mode of operation.
12.2 PUBLIC KEYS
# Name Description
1. Christie Root CA Key RSA 2048 – Christie Root CA key
2. Certificate Chain RSA 2048 – Christie Certificate Chain
3. Christie Firmware Update Key RSA 2048 – Christie firmware verification key
Table 13 Public Keys
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13. PHYSICAL SECURITY
The Christie IMB-S3 is a multi-chip embedded cryptographic module which is composed of production-grade
components.
The physical security mechanisms of the module includes a hard, opaque and tamper-evident metal enclosure
that is monitored 24/7 by battery backed-up tamper detection and response mechanisms. Any attempt to remove
the metal enclosure results in instantaneous active zeroization. Zeroization also occurs if the battery becomes
discharged. The module includes tamper-evident labels covering the screws that secure the metal enclosure to
the module; said tamper-evident labels are installed as part of the manufacturing process and shall not be
removed (i.e. maintenance role is not supported, maintenance interface is not supported).
The tamper-evident metal enclosure and the tamper-evident labels shall be periodically inspected to ensure the
physical security of the module is maintained. Periodic inspection will occur each time the module is inserted or
removed from the projector.
All components which lie outside the metal enclosure are not security relevant and are excluded from the FIPS
140-2 requirements. The excluded components are the non-security relevant data input and data output, passive
components (capacitors, resistors, inductors), voltage regulators, traces and signals routed to these components,
the PCB lying outside the metal enclosure, connectors and the faceplate.
Note: The module hardness testing was only performed at a single temperature and no assurance is provided for
Level 3 hardness conformance at any other temperature.
Physical Security
Mechanism
Recommended
Frequency of
Inspection/Test
Inspection/Test Guidance Details
Metal enclosure Upon receipt of module
and as often as feasible.
Visually inspect metal enclosure for scratches, gouges,
deformation and other signs of visible signs of tamper.
Tamper Responsive
Switches
N/A N/A
Tamper Evident Seals Upon receipt of module
and as often as feasible.
Visually inspect the tamper evident seals for scratches,
gouges, deformation or other physical signs of
tampering.
Table 14 Inspection/Testing of Physical Security Mechanisms
If any tampering of the module is observed or suspected, remove the module from service and return it to
Christie Digital.
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14. OPERATIONAL ENVIRONMENT
The Christie IMB-S3 operates in a limited operational environment that only allows the loading of trusted and
validated firmware binary images through an authenticated service. Firmware binary images are signed by an
RSA key which is part of the Christie certificate chain. The RSA signature verification algorithm has been
validated (RSA Cert. #1062).
Any firmware loaded into this module that is not shown on the module certificate, is out of the scope of this
validation and requires a separate FIPS 140-2 validation.
15. SELF-TESTS
The module performs the following self-tests:
 Power Up Self-Tests
o Cryptographic algorithm tests:
 SHA-256 KAT
 RSA 2048 Signature Verification KAT
o Firmware Integrity Test - EDC that meets requirements of AS09.24
o Critical Functions Tests: N/A
 Conditional Self-Tests
o Firmware Load Test (RSA signature verification – RSA 2048 with SHA-256)
16. MITIGATION OF OTHER ATTACKS
The cryptographic module does not mitigate any specific attacks beyond the scope of FIPS 140-2.
Other Attacks Mitigation Mechanism Specific Limitations
N/A N/A N/A
Table 15 Mitigation of Other Attacks
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17. SECURITY RULES
The following specifies the security rules under which the cryptographic module shall operate:
 The module does not support a bypass capability or a maintenance interface.
 The module supports concurrent operators. However, the module does not support more than one
operator per role. The operators may not switch roles without re-authenticating.
 The operator must re-authenticate on each power-up event.
 The module inhibits data output during an error state and during the power-up self-tests.
 The module shall enforce identity-based authentication.
 The module does not provide feedback of authentication data.
 An error state may be cleared by power-cycling the module.
 Failure of Power Up Self-Tests, described in Section 15, will result in a “Red” FIPS LED Status. The
module will enter the error state; all cryptographic operations are inhibited.
 Failure of conditional Self-Tests, described in Section 15, will result in a “soft” error. The error is
indicated via the Status service as follows:
[ERR ][16384] [SM UPGRADE] Signature verification failed.
[ERR ][16384] [SM UPGRADE] Upgrade package integrity check failed.
 The module provides logical separation between all the data input, control input, data output and status
output interfaces.
 The module protects all public keys from unauthorized modification and unauthorized substitution.
 The module does not support manual key entry. A manual key entry test is not implemented.
 The module does not support split-knowledge processes.
 The operator may perform on-demand power-on self-test by recycling power to the module.
 The status output does not contain CSPs or sensitive data that if misused could lead to a compromise of
the module.
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18. ACRONYMS
Acronym Definition
AES Advanced Encryption Standard
CSP Critical Security Parameter
DAS Direct Attached Storage
DCI Digital Cinema Initiatives, LLC
DCP Digital Cinema Package
DRNG Deterministic Random Number Generator
EMC Electromagnetic Compatibility
EMI Electromagnetic Interference
FCC Federal Communications Commission
FIPS Federal Information Processing Standards
FPGA Field Programmable Gate Array
HMAC Hashed Message Authentication Code
IMB Image Media Block
KAT Known Answer Test
KDM Key Delivery Message – as per SMPTE 430-1
MAC Media Access Control
NAS Network Attached Storage
RSA Rivest-Shamir-Adleman
SHA Secure Hash Algorithm
TI Texas Instruments Incorporated
TI ECDH Considered as non-security relevant data obfuscation (plaintext) and only used to interoperate
with legacy equipment
TLS Transport Layer Security
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19. APPENDIX A: CRITICAL SECURITY PARAMETERS
The module does not contain secret, private keys and CSPs in the Approved mode of operation.
20. APPENDIX B: PUBLIC KEYS
The module supports the following public keys:
1. Christie Root CA Key
Description: digitally signed and thus authorizes other public keys to be used by the module for a
defined purpose
Type: RSA 2048
Generation: N/A - Installed into the module within the secure factory during manufacturing
Storage: Stored in Flash in self-signed certificate; RAM
Entry: N/A - Installed into the module within the secure factory during manufacturing
Output: In X.509 certificate upon request
Establishment: N/A
Key-to-entity: via memory location and CRC-16
2. Certificate Chain
Description: digitally verify public keys
Type: RSA 2048
Generation: N/A - Installed into the module within the secure factory during manufacturing
Storage: Stored in Flash in certificate signed by Christie Root CA Key; RAM
Establishment: N/A
Entry: N/A - Installed into the module within the secure factory during manufacturing
Output: In X.509 certificate upon request
Key-to-entity: via memory location and CRC-16
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3. Christie Firmware Update Key
Description: Used to securely update the firmware via RSA signature verification via the Upgrade
service.
Type: RSA 2048
Generation: N/A - generated outside of the crypto boundary by Christie
Storage: RAM
Establishment: N/A
Entry: Entered into the module via a certificate signed by the Certificate Chain
Output: In X.509 certificate upon request
Key-to-entity: via memory location and CRC