The Red Pike reference article from the English Wikipedia on 24-Apr-2004
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Red Pike

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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]. 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, and internal operations similar to RC5.

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

See also

References

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Block ciphers
Algorithms: 3-Way | AES | Blowfish | Camellia | CAST-128 | CAST-256 | DES | DES-X | FEAL | G-DES | GOST | IDEA | Iraqi | KASUMI | KHAZAD | Khufu and Khafre | LOKI97 | Lucifer | MAGENTA | MARS | MISTY1 | RC2 | RC5 | RC6 | Red Pike | Rijndael | S-1 | SAFER | Serpent | SHARK | Skipjack | Square | TEA | Triple DES | Twofish | XTEA
Design: Feistel network | Key schedule | Product cipher | S-box | SPN   Attacks: Brute force | Linear / Differential cryptanalysis   Standardisation: AES process | CRYPTREC | NESSIE   Misc: Block size | IV | Key size | Modes of operation