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A simplified and generalized treatment of DES related ciphers

This work is a study of DES-like ciphers where the bitwise exclusive-or (XOR) operation in the underlying Feistel network is replaced by an arbitrary group operation. We construct a two round simplified version of DES that contains all the DES components and show that its set of encryption permutations is not a group under functional composition, it is not a pure cipher and its set of encryption permutations does not generate the alternating group. We present a non-computational proof that for n\leq6 the set of n-round Feistel permutations over an arbitrary group do not constitute a group under functional composition.

preprint2012arXivOpen access
Liljana BabinkostovaAlyssa M. BowdenAndrew M. KimballKameryn J. Williams
Cryptography and Securitymath.GR
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Open access4 authors2 topics
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Liljana BabinkostovaAlyssa M. BowdenAndrew M. KimballKameryn J. Williams

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