Key complication procedure in data driven ciphers based on controlled substitution-permutation networks

In this paper we considered some ways of crypto algorithm enhancement to attacks based on related keys with the combination of the differential cryptanalysis. As a one way, we highlight enhancement key mechanism. In order to provide high speed of crypto algorithms based on controlled substitution-permutation networks, we propose to use the schemes of iterative generation of round cipher keys, in which generation of the next round key is implemented simultaneously with the current encryption round.