A new method for known plaintext attack of FEAL cipher

  • Authors:
  • Mitsuru Matsui;Atsuhiro Yamagishi

  • Affiliations:
  • Computer & Information Systems Laboratory, Mitsubishi Electric Corporation, Kanagawa, Japan;Computer & Information Systems Laboratory, Mitsubishi Electric Corporation, Kanagawa, Japan

  • Venue:
  • EUROCRYPT'92 Proceedings of the 11th annual international conference on Theory and application of cryptographic techniques
  • Year:
  • 1992

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Abstract

We propose a new known plaintext attack of FEAL cipher. Our method differs from previous statistical ones in point of deriving the extended key in definite way. As a result, it is possible to break FEAL-4 with 5 known plaintexts and FEAL-6 with 100 known plaintexts respectively. Moreover, we show a method to break FEAL-8 with 215 known plaintexts faster than an exhaustive search.