Cryptanalysis of SPEED

C. Hall, J. Kelsey, V. Rijmen, B. Schneier, and D. Wagner.

Fifth Annual Workshop on Selected Areas in Cryptography, Springer Verlag, August 1998, to appear.

ABSTRACT: The cipher family SPEED (and an associated hashing mode) was recently proposed in Financial Cryptography '97. This paper cryptanalyzes that proposal, in two parts: First, we discuss several troubling potential weaknesses in the cipher. Next, we show how to efficiently break the SPEED hashing mode using differential related-key techniques, and propose a differential attack on 48-round SPEED. These results raise some significant questions about the security of the SPEED design.

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Extended Abstract

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