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Title:
Cryptanalysis of GOST2
Authors: Tomer Ashur, Achiya Bar-On, Orr Dunkelman
Abstract:GOST 28147 is a 256-bit key 64-bit block cipher developed by the USSR, later adopted by the Russian government as a national standard. In 2010, GOST was suggested to be included in ISO-18033, but was rejected due to weaknesses found in its key schedule. In 2015, a new version of GOST was suggested with the purpose of mitigating such attacks. In this paper, we show that similar weaknesses exist in the new version as well. More specifically, we present a fixed-point attack on the full cipher with time complexity of 2^{237} encryptions. We also present reflection which improves on exhaustive search by a factor of 2e attack with time complexity of 2^{192} for a key that is chosen from a class of 2^{224} weak keys. Finally, we discuss an impossible reflection attack and several possible related-key attacks.
ePrint: https://eprint.iacr.org/2016/532
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