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Erschienen in:
2008 | OriginalPaper | Buchkapitel
Attack and Improvement of a Secure S-Box Calculation Based on the Fourier Transform
verfasst von : Jean-Sébastien Coron, Christophe Giraud, Emmanuel Prouff, Matthieu Rivain
Erschienen in: Cryptographic Hardware and Embedded Systems – CHES 2008
Verlag: Springer Berlin Heidelberg
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At CHES 2006, a DPA countermeasure based on the Fourier Transform was published. This generic countermeasure aims at protecting from DPA any S-box calculation used in symmetric cryptosystems implementations. In this paper, we show that this countermeasure has a flaw and that it can be broken by first order DPA. Moreover, we have successfully put into practice our attack on two different S-box implementations. Finally, we propose an improvement of the original countermeasure and we prove its security against first order DPA.