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Erschienen in:
2006 | OriginalPaper | Buchkapitel
Practical Second-Order DPA Attacks for Masked Smart Card Implementations of Block Ciphers
verfasst von : Elisabeth Oswald, Stefan Mangard, Christoph Herbst, Stefan Tillich
Erschienen in: Topics in Cryptology – CT-RSA 2006
Verlag: Springer Berlin Heidelberg
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In this article we describe an improved concept for second-order differential-power analysis (DPA) attacks on masked smart card implementations of block ciphers. Our concept allows to mount second-order DPA attacks in a rather simple way: a second-order DPA attack consists of a pre-processing step and a DPA step. Therefore, our way of performing second-order DPA attacks allows to easily assess the number of traces that are needed for a successful attack. We give evidence on the effectiveness of our methodology by showing practical attacks on a masked AES smart card implementation. In these attacks we target inputs and outputs of the SubBytes operation in the first encryption round.