Mathematical Methods of Cryptography

On extending the class of impossible differencials for the KB-256 algorithm

A. B. Chuhno, D. A. Zakharov


Abstract: The presence of impossible differentials in the block encryption algorithm can lead to effective methods for recovering the secret key. Previously, a large number of impossible differentials was found for the KB-256 algorithm. In this paper, $2^{32}$ impossible differencials into 16 and 10 iterations of the KB-256 algorithm with two active subblocks have been constructed.

Keywords: KB-256, impossible differential cryptanalysis.

UDC: 519.7

DOI: 10.17223/2226308X/18/37