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Improved Cryptanalysis of Rijndael

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Improved Cryptanalysis of Rijndael

N. Ferguson, J. Kelsey, S. Lucks, B. Schneier, M. Stay, D. Wagner, and D. Whiting

Seventh Fast Software Encryption Workshop, Springer-Verlag, 2000, to appear.

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. Finally, we discuss the key schedule of Rijndael and describe a related-key attack that can break 9-round Rijndael with 256-bit keys.

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