A new version of the RC6 algorithm, stronger against X2 cryptanalysis

  • Authors:
  • Routo Terada;Eduardo T. Ueda

  • Affiliations:
  • University of São Paulo, Brazil;University of São Paulo, Brazil

  • Venue:
  • AISC '09 Proceedings of the Seventh Australasian Conference on Information Security - Volume 98
  • Year:
  • 2009

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Abstract

We analyze the X2 cryptanalysis, one of the most successful cryptanalysis technique against the RC6 algorithm. We apply this type of cryptanalysis as distinction cryptanalysis as well as key-recovery crypt-analysis. We present a modified version of RC6 by introducing a very simple data-dependent swapping function in its structure. The conclusions inferred by statistical experiments is that this modified version is stronger against the X2 cryptanalysis technique.