On the universal hash functions in Luby-Rackoff cipher

  • Authors:
  • Tetsu Iwata;Kaoru Kurosawa

  • Affiliations:
  • Department of Computer and Information Sciences, Ibaraki University, Hitachi, Ibaraki, Japan;Department of Computer and Information Sciences, Ibaraki University, Hitachi, Ibaraki, Japan

  • Venue:
  • ICISC'02 Proceedings of the 5th international conference on Information security and cryptology
  • Year:
  • 2002

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Abstract

It is known that a super-pseudorandom permutation on 2n bits can be obtained from a random function f on n bits and two bisymmetric and AXU hash functions h1 and h2 on n bits. It has a Feistel type structure which is usually denoted by φ(h1, f, f, h2). Bisymmetric and AXU hash functions h1, h2 are much weaker primitives than a random function f and they can be computed much faster than random functions. This paper shows that we can further weaken the condition on h1.