2007 | OriginalPaper | Buchkapitel
Algebraic Immunity of S-Boxes and Augmented Functions
verfasst von : Simon Fischer, Willi Meier
Erschienen in: Fast Software Encryption
Verlag: Springer Berlin Heidelberg
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In this paper, the algebraic immunity of S-boxes and augmented functions of stream ciphers is investigated. Augmented functions are shown to have some algebraic properties that are not covered by previous measures of immunity. As a result, efficient algebraic attacks with very low data complexity on certain filter generators become possible. In a similar line, the algebraic immunity of the augmented function of the eSTREAM candidate
Trivium
is experimentally tested. These tests suggest that
Trivium
has some immunity against algebraic attacks on augmented functions.