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Red Pike



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" Little is publicly known about Red Pike, except that it is a block cipher] with a 64-bit [[block size (cryptography)|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".



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