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Title:
Rebound attacks on Stribog
Authors: Riham AlTawy, Aleksandar Kircanski, Amr M. Youssef
Abstract:In August 2012, the Stribog hash function was selected as the new Russian hash standard (GOST R 34.11-2012). Stribog is an AES-based primitive and is considered as an asymmetric reply to the new SHA-3. In this paper we investigate the collision resistance of the Stribog compression function and its internal cipher. Specifically, we present a message differential path for the internal block cipher that allows us to efficiently obtain a 5-round free-start collision and a 7.75 free-start near collision for the internal cipher with complexities 2^8 and 2^{40}, respectively. Finally, the compression function is analyzed and a 7.75 round semi free-start collision, 8.75 and 9.75 round semi free-start near collisions are presented along with an example for 4.75 round 49 out of 64 bytes near colliding message pair.
ePrint: https://eprint.iacr.org/2013/539
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