Red Pikeclassified 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 and 64-bit key length, and internal operations similar to RC5.
Thames Bridge and Rambutan are names of other classified UK ciphers.
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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