Welcome to the resource topic for 2015/812
Title:
The Secret Structure of the S-Box of Streebog, Kuznechik and Stribob
Authors: Alex Biryukov, Léo Perrin, Aleksei Udovenko
Abstract:The last hash function and block cipher standardized by the Russian standardization body (GOST) both use the same S-Box. It is also used by an independent CAESAR candidate. This transformation is only specified as a look up table and the reason behind its choice is unknown. We managed to reverse-engineer this S-Box and describe its unpublished structure. Our decomposition allows a much more efficient hardware implementation but the choice of the components used is puzzling from a cryptographic perspective. This extended abstract does not explain \emph{how} we found this decomposition. We will describe our process in an extended version of this paper.
ePrint: https://eprint.iacr.org/2015/812
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