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Title:
A New Related-Key Boomerang Distinguishing Attack of Reduced-Round Threefish-256
Authors: Shusheng Liu, Libin Wang, Zheng Gong
Abstract:On Nov 2007, NIST announced the SHA-3 competition to select a new hash standard as a replacement of SHA-2. On Dec 2010, five submissions have been selected as the final round candidates, including Skein, which have components based on ARX. In this paper, a new related-key boomerang distinguishing attack is proposed on 31-round Threefish-256 with a time complexity of about 2^{234}. Our improved attack is based on the efficient algorithms for calculating differentials of modular addition.
ePrint: https://eprint.iacr.org/2011/323
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