SHARK

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For other uses, see SHARK (disambiguation).
SHARK
General
Designers Vincent Rijmen, Joan Daemen, Bart Preneel, Antoon Bosselaers, Erik De Win
First published 1996
Successors KHAZAD, Rijndael
Cipher detail
Key sizes 128 bits
Block sizes 64 bits
Structure Substitution-permutation network
Rounds 6

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 uses an MDS matrix representing a Reed-Solomon error correcting code in order to guarantee good diffusion. The nonlinear layer is composed of eight 8×8-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 an interpolation attack (Jakobsen and Knudsen, 1997).

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