Information AboutShark |
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| block ciphers | |
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In Cryptography , SHARK is a Block Cipher identified as one of the predecessors of Rijndael (the Advanced Encryption Standard ). SHARK has a 64-bit Block Size and a 128-bit Key Size . It is a six round SP-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-box es based on the function ''F(x) = x-1'' over ''GF(28)''. Five rounds of a modified version of SHARK can be broken using an Interpolation Attack (Jakobsen and Knudsen, 1997). SEE ALSO REFERENCES
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