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The Rectangle Attack - Rectangling the Serpent
Authors: Biham Eli, Orr Dunkelman, Nathan KellerAbstract:
Serpent is one of the 5 AES finalists. The best attack published so far
analyzes up to 9 rounds. In this paper we present attacks on 7-round,
8-round, and 10-round variants of Serpent. We attack 7-round variant of
Serpent with all key lengths, and 8- and 10-round variants wih 256-bit keys.
The 10-roun attack on the 256-bit keys variants is the best published
attack on the cipher. The attack enhances the amplified boomerang attack
and uses better differentials. We also present the best 3-round, 4-round,
5-round and 6-round differential characteristics of Serpent.
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