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On Weaknesses of Non—surjective Round Functions

In: Selected Areas in Cryptography

Author

Listed:
  • 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)

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.

Suggested Citation

  • Vincent Rijmen & Bart Preneel & Erik De Win, 1997. "On Weaknesses of Non—surjective Round Functions," Springer Books, in: Evangelos Kranakis & Paul Van Oorschot (ed.), Selected Areas in Cryptography, pages 41-54, Springer.
    • Handle: RePEc:spr:sprchp:978-1-4615-5489-9_4
    DOI: 10.1007/978-1-4615-5489-9_4
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