Red Pike - Definition and Overview

Red Pike is a classified United Kingdom government cipher, proposed for use by the National Health Service by GCHQ, but designed for a "broad range of applications in the British government" [1] (http://www.cs.berkeley.edu/~daw/rja/GCHQ/25_2_97.htm). Little is publicly known about Red Pike, except that it is a block cipher with a 64-bit block size and 64-bit key length. According to the academic study of the cipher cited below and quoted in a paper by Ross Anderson and Markus Kuhn, it "uses the same basic operations as RC5" (add, XOR, and left shift) and "has no look-up tables, virtually no key schedule and requires only five lines of code"; "the influence of each key bit quickly cascades" and "each encryption involves of the order of 100 operations".

Thames Bridge and Rambutan are names of other classified UK ciphers.

See also

• Type 1 product

References

• C Mitchell, S Murphy, F Piper, P Wild. (1996). Red Pike — an assessment. Codes and Ciphers Ltd 2/10/96.
• Paper by Anderson and Kuhn which includes excerpts from (Mitchell et. al., 1996) (http://www.ftp.cl.cam.ac.uk/ftp/users/rja14/dfa)
• "The use of encryption and related services with the NHSnet" (http://www.cypherspace.org/adam/ukexport/zergo.html)

Example Usage of Pike