A Time-Memory Tradeoff Attack Against LILI-128

  • Authors:
  • Markku-Juhani Olavi Saarinen

  • Affiliations:
  • -

  • Venue:
  • FSE '02 Revised Papers from the 9th International Workshop on Fast Software Encryption
  • Year:
  • 2002

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Abstract

In this note we discuss a novel and simple time-memory tradeoff attack against the stream cipher LILI-128. The attack defeats the security advantage of having an irregular stepping function. The attack requires 246 bits of keystream, a lookup table of 245 89-bit words and computational effort which is roughly equivalent to 248 DES operations.