Improved Cryptanalysis of Rijndael

  • Authors:
  • Niels Ferguson;John Kelsey;Stefan Lucks;Bruce Schneier;Michael Stay;David Wagner;Doug Whiting

  • Affiliations:
  • -;-;-;-;-;-;-

  • Venue:
  • FSE '00 Proceedings of the 7th International Workshop on Fast Software Encryption
  • Year:
  • 2000

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Abstract

We improve the best attack on Rijndael reduced to 6 rounds from complexity 272 to 244. We also present the first known attacks on 7- and 8-round Rijndael. The attacks on 8-round Rijndael work for 192- bit and 256-bit keys. Finally, we discuss the key schedule of Rijndael and describe a related-key attack that can break 9-round Rijndael with 256-bit keys.