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In this paper we present generic attacks on the Lai–Massey scheme inspired by Patarin’s attacks on the Feistel scheme. For bijective round functions, the attacking results are better than non-bijective round functions for the 3, 4-round Lai–Massey scheme. Our results show that there are some security differences of these two schemes against known attacks. The generic attacks on the 4-round and 5-round...
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