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Chips Harris ← CITADEL I
Type 4 cryptographic engine
- this page is a stub
Citadel II is a military-grade cryptographic engine for non-Type 1
applications 1 developed in 2004 by the RF Communications Division of
Harris Corporation
(now: L3Harris)
in Rochester (NY,USA).
It is the successor to the popular and widely accepted
Citadel I encryption engine.
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Citadel II is provided as a chip that can be embedded in customer's
equipments. It uses a Harris-proprietary encryption algorithm that is
known as MK-256. Three variants of it are available to the
user. Some aspects of the algorithm were presented on the IEEE MILCOM
conference in 2004 [A].
The image on the right shows the Citadel II chip on the crypto board
inside the Falcon II military handheld radio of the US Army,
as photographed by Bryan Fields (W9CR) in 2019.
Visit his wiki
for more detailed pictures of the Falcon II [2].
➤ Read the description of the algorithm
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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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- Description of the Citadel II encryption algorithm
Customizable Cryptographic Architecture for Government and Military
Communications Applications.
Michael Kurdziel, Robert Clements & Gary Dennis, Harris Corporation.
First published by IEEE, MILCOM, January 2004. 1
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Copy obtained from ResearchGate website [1].
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Products that use Citadel II
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RF-5800V-HH Falcon II VHF handheld radio - RF-7800T-HH
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Any links shown in red are currently unavailable.
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© Crypto Museum. Created: Saturday 09 November 2019. Last changed: Monday, 13 May 2024 - 21:23 CET.
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![Citadel II chip inside the Falcon II handheld radio. Photograph copyright Bryan Fields (W9CR) [2]](img/citadel2_large.jpg)