[Resource Topic] 2020/645: Correlation distribution analysis of a two-round key-alternating block cipher

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Title:
Correlation distribution analysis of a two-round key-alternating block cipher

Authors: Liliya Kraleva, Nikolai L. Manev, Vincent Rijmen

Abstract:

In this paper we study two-round key-alternating block ciphers with round function f(x)=x^{(2^t+1)2^s}, where t,s are positive integers. An algorithm to compute the distribution weight with respect to input and output masks is described. In the case t=1 the correlation distributions in dependence on input and output masks are completely determined for arbitrary pairs of masks. We investigate with more details the case f(x)=x^3 and fully derive and classify the distributions, proving that there are only 5 possible values for the correlation for any pair of masks.

ePrint: https://eprint.iacr.org/2020/645

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