Rambutan (cryptography)

Rambutan (Cryptography)

Rambutan (cryptography)

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Rambutan is a family of encryption technologies <!-- they seem to use "rambutan" to describe the whole package, not just a cipher--> designed by the Communications-Electronics Security Group (CESG), the technical division of the United Kingdom government's secret communications agency, GCHQ.

It includes a range of encryption products designed by CESG for use in handling confidential (not secret) communications between parts of the British government, government agencies, and related bodies such as NHS Trusts. Unlike CESG's Red Pike system, Rambutan is not available as software: it is distributed only as a self-contained electronic device (an ASIC) which implements the entire cryptosystem and handles the related key distribution and storage tasks., report by Zergo Ltd., mirrored on CryptomeSchneier, Bruce Applied Cryptography (2nd ed), John Wiley & Sons, 1996

Technical details of the Rambutan algorithm are secret. Security researcher Bruce Schneier describes it as being a stream cipher (linear feedback shift register) based cryptosystem with 5 shift registers each of around 80 bits, and a key size of 112 bits. RAMBUTAN-I communications chips (which implement a secure X.25 based communications system) are made by approved contractors Racal and Baltimore Technologies/Zergo...
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