Schneier on Security

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, 2001, pp. 213-230.

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.

[full text – postscript] [full text – PDF (Acrobat)]

Categories: Algorithm Analyses