Everything about Shark totally explained
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).
Further Information
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