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  Cryptanalysis of Skipjack reduced to 31 rounds using impossible differentials (1999) [59 citations — 12 self]

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by Eli Biham, Alex Biryukov, Adi Shamir
http://www.cs.technion.ac.il/users/wwwb/cgi-bin/tr-get.cgi/1998/CS/CS0947.ps.gz
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Abstract:

Abstract. In this paper we present a new cryptanalytic technique, based on impossible differentials, and use it to show that Skipjack reduced from 32 to 31 rounds can be broken by an attack which is faster than exhaustive search.

Citations

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1 Cryptanalysis of Ladder-DES, proceedings of Fast Software Encryption – Biham - 1997