Paper 2015/812 Original: eprint.iacr.org/2015/812 ↗
The Secret Structure of the S-Box of Streebog, Kuznechik and Stribob
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 We managed to reverse-engineer this S-Box and describe its unpublished structure.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.
Metadata
- Available format(s)
PDF- Category
- Secret-key cryptography
- Publication info
- Preprint.
- History
- 2015-08-31: last updated
- 2015-08-14: published
- Short URL
- https://ia.cr/2015/812
- License
- https://creativecommons.org/licenses/by/4.0/
BibTeX
@misc{cryptoeprint:2015/812,
author = {Alex Biryukov and Léo Perrin and Aleksei Udovenko},
title = {The Secret Structure of the S-Box of Streebog, Kuznechik and Stribob},
howpublished = {Cryptology {ePrint} Archive, Paper 2015/812},
year = {2015},
url = {https://eprint.iacr.org/2015/812}
}