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Chips Harris CITADEL II →
Type 4 cryptographic engine
- this page is a stub
CITADEL
is a military-grade cryptographic engine
for non-Type 1 applications 1 developed in 1997 by
Harris Corporation in Rochester (NY,USA).
Approved for export from the USA, it can be embedded in customer's equipment.
It provides 3 cryptographic algorithms, based on a mixed-mode
arithmetic block cipher, that are said to withstand sophisticated
cryptographic attacks.
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Citadel is provided as a chip – as shown in the image on the right –
that can be incorporated in a customer's equipments.
It features a Harris-developed proprietary encryption algorithm,
known as MK-128, that is implemented entirely in hardware,
and has been designed in such a way that its executes slowly in software [1].
Some aspects of the MK-128 algorithm are explained in a 2009 presentation [1]
of Michael Kurdziel, the Chief Cryptographer of Harris Corporation at the time.
According to Kurziel, Citadel uses a key length of 64 to 128-bits.
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With a key length of 115 bits, it is estimated that the algorithm is strong
enough to provide 50 years of security. 2
According to the product leaflet, Citadel uses a Traffic Encryption Key (TEK) and a Key Encryption Key (KEK) with a minimum length of 64-bits each.
Citadel was first used in a commercially available
product in 1998, and has since become a widely accepted cryptographic
engine, both in the US and elsewhere, for example in the Harris Falcon II
range of military radios.
Citadel was presented for peer review on the IEEE MILCOM conference
in 1998.
In 2004, it was succeeded by Citadel II,
which offers improved cipher security and is claimed to use 256-bit keys.
Note that Citadel was not used by the US Government and by the US Army.
Instead, the US (and some of its allies) use the
Sierra
and Sierra II
cryptographic engines, which provide several Type 1 algorithms.
Sierra and Sierra II are backward compatible with Citadel and
Citadel II respectively.
➤ Read Citadel datasheet
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Type 1
refers to NSA endorsed
classified or controlled cryptographic
items (CCI) that are approved for the transmission of
Classified or Sensitive US Government Information (TOP SECRET, or TS).
The fact that no export licence is required for Citadel, means that it is
a Type 4 device.
➤ More
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20 years of fielded service and 30 years of legacy.
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Products on this website that use Citadel
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Other products that use Citadel
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RF-5800V Falcon II VHF manpack radio RF-5800H Falcon II HF manpack radio RF-5800M Falcon II multi-band manpack radio RF-5800V-HH Falcon II VHF handheld radio RF-5800M-HH Falcon II multi-band handheld radio AN/PRC-152(C) Falcon III multiband handheld radio
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- Half-duplex encryption/decryption
- Up to 5 Mbps
- Serial or parallel clear and encrypted data
- Key management support
- Non-Type 1 encryption
- Configurable key lengths (64 to 128 bits)
- Secure against differential and linear cryptanalysis
- Third party verified
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- Standard Citadel high-grade algorithm
- Harris-configured Citadel algorithm (customer unique)
- Customer-configurable Citadel algorithm
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- Block Cipher Feedback
- Self-synchronizing Cipher Feedback (autoclave)
- Long Cycle or Minimum Error Propagation
- Codebook (key processing only)
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- Traffic Encryption Key (TEK), minimum length 1.8·1019 (64 bits)
- Key Encryption Key (KEK), minimum length 1.8·1019 (64 bits)
- On-chip key storage for KEKs anbd TEKs
- Key wrapping/unwrapping
- Key updating
- Deterministic key generation
- Non-deterministic key generation
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Power 3.3 or 5V Parallel 8- or 16-bit Serial traffic Seperate plaintext and ciphertext ports Serial fill Key loading (red) Serial EEPROM User configurable Housekeeping /RESET, /ZERO, STAND_ALONE, CONFIG, /DE Test port Test Access Port (TAP) for Boundary Scan
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- 80-pin TQFP (16 x 16 mm
- 3.3V and 5V CMOS compatible signal levels
- Temperature -40°C tp +85°C
- Speed up to 5 Mbps
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© Crypto Museum. Created: Friday 08 November 2019. Last changed: Monday, 13 May 2024 - 21:23 CET.
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