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SHARK has a 64-bit block size and a 128-bit key size. It is a six round SPN network which alternates a key mixing stage with linear and non-linear transformation layers. The linear transformation is derived from an error correcting code (a Reed-Solomon code) in order to guarantee good diffusion. The nonlinear layer is composed of eight 8-bit S-boxes based on the function F(x) = x-1 over GF(28).
Five rounds of a modified version of SHARK can be broken using a interpolation attack (Jakobsen and Knudsen, 1997).
| Block ciphers [ }|action=edit}} Edit }] |
| Algorithms: 3-Way | AES | Akelarre | Blowfish | Camellia | CAST-128 | CAST-256 | CMEA | DEAL | DES | DES-X | FEAL | FROG | G-DES | GOST | ICE | IDEA | Iraqi | KASUMI | KHAZAD | Khufu and Khafre | LOKI89/91 | LOKI97 | Lucifer | MacGuffin | Madryga | MAGENTA | MARS | MISTY1 | MMB | NewDES | RC2 | RC5 | RC6 | REDOC | Red Pike | S-1 | SAFER | SEED | Serpent | SHACAL | SHARK | Skipjack | Square | TEA | Triple DES | Twofish | XTEA |
| Design: Feistel network | Key schedule | Product cipher | S-box | SPN Attacks: Brute force | Linear / Differential cryptanalysis | Mod n | XSL Standardisation: AES process | CRYPTREC | NESSIE Misc: Avalanche effect | Block size | IV | Key size | Modes of operation | Piling-up lemma | Weak key |