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Erschienen in:
2010 | OriginalPaper | Buchkapitel
On Unbiased Linear Approximations
verfasst von : Jonathan Etrog, Matthew J. B. Robshaw
Erschienen in: Information Security and Privacy
Verlag: Springer Berlin Heidelberg
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In this paper we explore the recovery of key information from a block cipher when using unbiased linear approximations of a certain form. In particular we develop a theoretical framework for their treatment and we confirm their behaviour with experiments on reduced-round variants of DES. As an application we show a novel form of linear cryptanalysis using multiple linear approximations which can be used to extract key information when all pre-existing techniques would fail.