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.[1] Rambutan is not sold outside the government sector.[2]
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.[2] RAMBUTAN-I communications chips (which implement a secure X.25 based communications system) are made by approved contractors Racal and Baltimore Technologies/Zergo Ltd.[3][4] CESG later specified RAMBUTAN-II, an enhanced system with backward compatibility with existing RAMBUTAN-I infrastructure.[5] The RAMBUTAN-II chip is a 64-pin quad ceramic pack chip, which implements the electronic codebook, cipher block chaining, and output feedback operating modes (each in 64 bits) and the cipher feedback mode in 1 or 8 bits.[6] Schneier suggests that these modes may indicate Rambutan is a block cipher rather than a stream.[2] The three 64 bit modes operate at 88 megabits/second.[6] Rambutan operates in three modes: ECB, CBC, and 8 bit CFB.[7]
ReferencesEdit
^"The use of encryption and related services with the NHSnet", report by Zergo Ltd.
^ abcSchneier, Bruce Applied Cryptography (2nd ed), John Wiley & Sons, 1996
^Racal Rambutan SAFE X25 and Rambutan SAFE 2M product descriptions 30 September 2007 at the Wayback Machine
^Baltimore Technologies (UK) approved Rambutan devices 30 September 2007 at the Wayback Machine
^"RAMBUTAN-II" 6 February 2007 at the Wayback Machine, CESG website, URL retrieved 17 December 2006
^ ab"RAMBUTAN II cryptographic chip" 28 September 2007 at the Wayback Machine, CESG brochure
^Schneier, Bruce (25 May 2017). Applied Cryptography: Protocols, Algorithms and Source Code in C. John Wiley & Sons. ISBN9781119439028.
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rambutan, cryptography, rambutan, family, encryption, technologies, designed, communications, electronics, security, group, cesg, technical, division, united, kingdom, government, secret, communications, agency, gchq, includes, range, encryption, products, des. Rambutan is a family of encryption technologies 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 1 Rambutan is not sold outside the government sector 2 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 2 RAMBUTAN I communications chips which implement a secure X 25 based communications system are made by approved contractors Racal and Baltimore Technologies Zergo Ltd 3 4 CESG later specified RAMBUTAN II an enhanced system with backward compatibility with existing RAMBUTAN I infrastructure 5 The RAMBUTAN II chip is a 64 pin quad ceramic pack chip which implements the electronic codebook cipher block chaining and output feedback operating modes each in 64 bits and the cipher feedback mode in 1 or 8 bits 6 Schneier suggests that these modes may indicate Rambutan is a block cipher rather than a stream 2 The three 64 bit modes operate at 88 megabits second 6 Rambutan operates in three modes ECB CBC and 8 bit CFB 7 References Edit The use of encryption and related services with the NHSnet report by Zergo Ltd a b c Schneier Bruce Applied Cryptography 2nd ed John Wiley amp Sons 1996 Racal Rambutan SAFE X25 and Rambutan SAFE 2M product descriptions Archived 30 September 2007 at the Wayback Machine Baltimore Technologies UK approved Rambutan devices Archived 30 September 2007 at the Wayback Machine RAMBUTAN II Archived 6 February 2007 at the Wayback Machine CESG website URL retrieved 17 December 2006 a b RAMBUTAN II cryptographic chip Archived 28 September 2007 at the Wayback Machine CESG brochure Schneier Bruce 25 May 2017 Applied Cryptography Protocols Algorithms and Source Code in C John Wiley amp Sons ISBN 9781119439028 nbsp This cryptography related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Rambutan cryptography amp oldid 1090736477, wikipedia, wiki, book, books, library,
