Cryptology ePrint Archive: Report 2019/1249

Related-key Attack on 5-Round Kuznyechik

Vitaly Kiryukhin

Abstract: The first related-key attack on 3-round (of 9) Kuznyechik with 2-round (of 8) key schedule was presented in CTCrypt'18. This article describes a related-key attack on 5-round cipher with the same key schedule. The presented one also has a practical complexity ($2^{32}$ operations, $2^{30}$ memory, $2^{16}$ related keys) and verified in practice. We obtained result due to the simultaneous use of the integral properties of the cipher transformations and the key schedule.

Category / Keywords: secret-key cryptography / Kuznyechik, related-key attack, integral cryptanalysis

Original Publication (in the same form): CTCrypt 2019, 8th Workshop on Current Trends in Cryptology

Date: received 24 Oct 2019, last revised 24 Oct 2019

Contact author: vitaly kiryukhin at infotecs ru

Available format(s): PDF | BibTeX Citation

Version: 20191028:075639 (All versions of this report)

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