International Association for Cryptologic Research

International Association
for Cryptologic Research

IACR News item: 21 June 2015

A.-M. Leventi-Peetz, J.-V. Peetz
ePrint Report ePrint Report
Methods are presented to derive with the aid of the computer mathematics

software system SageMath the Multivariate Quadratic equation systems (MQ) for the input and output bit variables of a cryptographic S-box starting from its algebraic expressions. Motivation to this work were the results of recent articles which we have verified and extended in an original way, to our knowledge, not yet published elsewhere. At the same time we present results contrary to the published ones which cast serious doubts on the suitability of previously presented formulas, supposed to quantify the resistance of S-boxes against algebraic attacks.

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