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EUROCRYPT
2006
Springer

Efficient Computation of Algebraic Immunity for Algebraic and Fast Algebraic Attacks

12 years 3 months ago
Efficient Computation of Algebraic Immunity for Algebraic and Fast Algebraic Attacks
In this paper we propose several efficient algorithms for assessing the resistance of Boolean functions against algebraic and fast algebraic attacks when implemented in LFSRbased stream ciphers. An algorithm is described which permits to compute the algebraic immunity d of a Boolean function with n variables in O(D2 ) operations, for D n d , rather than in O(D3 ) operations necessary in all previous algorithms. Our algorithm is based on multivariate polynomial interpolation. For assessing the vulnerability of arbitrary Boolean functions with respect to fast algebraic attacks, an efficient generic algorithm is presented that is not based on interpolation. This algorithm is demonstrated to be particularly efficient for symmetric Boolean functions. As an application it is shown that large classes of symmetric functions are very vulnerable to fast algebraic attacks despite their proven resistance against conventional algebraic attacks. Key words. Algebraic Attacks, Algebraic Degree, Boole...
Frederik Armknecht, Claude Carlet, Philippe Gabori
Added 22 Aug 2010
Updated 22 Aug 2010
Type Conference
Year 2006
Where EUROCRYPT
Authors Frederik Armknecht, Claude Carlet, Philippe Gaborit, Simon Künzli 0002, Willi Meier, Olivier Ruatta
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