On Weaknesses of Non—surjective Round Functions

Vincent Rijmen (), Bart Preneel () and Erik De Win ()
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Vincent Rijmen: Katholieke Universiteit Leuven, Dept. Elektrotechniek-ESAT/COSIC
Bart Preneel: Katholieke Universiteit Leuven, Dept. Elektrotechniek-ESAT/COSIC
Erik De Win: Katholieke Universiteit Leuven, Dept. Elektrotechniek-ESAT/COSIC

A chapter in Selected Areas in Cryptography, 1997, pp 41-54 from Springer

Abstract: Abstract We propose a new attack on Feistel ciphers with a non-surjective round function such as the CAST cipher family and LOKI91. We extend the attack towards block ciphers that use a non-uniformly distributed round function and apply the extended attack to the CAST family. This attack demonstrates that the round function of a Feistel cipher with six to eight rounds needs to be surjective and sufficiently uniform.

Keywords: block ciphers; cryptanalysis; CAST algorithms; LOKI91; statistical attack (search for similar items in EconPapers)
Date: 1997
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DOI: 10.1007/978-1-4615-5489-9_4

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