Cryptanalysis of SPEED

Published: Apr 04, 2000
Updated: Apr 04, 2000
Section: Network Security Library :: Cryptography
Author:
Company: Counterpane Internet Security, Inc.
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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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