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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 (232 operations, 230 memory, 216 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.

Related-key attack on 5-round Kuznyechik