Randomization Based Block Cipher with Key Mapped S-Box SelectionFull Text

ABSTRACT

This paper proposes a new system of Substitution-Permutation network along with Randomization Expansion of 240 bits of input data. System uses 16 S-Boxes which are selected randomly based on the subkey values throughout 64 rounds of substitution steps. 64 sub-keys are generated during the SubstitutionPermutation process. The middletext is transposed based on decimal value of the sub-key generated during the each round. A CBC mode is the best associated with this system.