Hybrid symmetric encryption using known-plaintext attack-secure components

  • Authors:
  • Kazuhiko Minematsu;Yukiyasu Tsunoo

  • Affiliations:
  • NEC Corporation, Kawasaki, Japan;NEC Corporation, Kawasaki, Japan

  • Venue:
  • ICISC'05 Proceedings of the 8th international conference on Information Security and Cryptology
  • Year:
  • 2005

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Abstract

This paper describes a hybrid symmetric cipher that combines a strongly-secure function, e.g., a pseudorandom function (PRF), which is secure against any Chosen-Plaintext Attack, and a weak PRF, which is only secure against any Known-Plaintext Attack. Although this kind of composition is potentially faster than the modes of PRFs, it has not been extensively studied. Our main contribution is in proposing a new block cipher scheme that is suitable for hybrid composition. We describe efficient hybrid constructions of pseudorandom permutation and strong pseudorandom permutation for an arbitrarily large block size using our new scheme.