Welcome to the resource topic for 2005/387
Title:
On highly nonlinear S-boxes and their inability to thwart DPA attacks (completed version)
Authors: C. Carlet
Abstract:Prouff has introduced recently, at FSE 2005, the notion of transparency order of S-boxes. This new characteristic is related to the ability of an S-box, used in a cryptosystem in which the round keys are introduced by addition, to thwart single-bit or multi-bit DPA attacks on the system. If this parameter has sufficiently small value, then the S-box is able to withstand DPA attacks without that ad-hoc modifications in the implementation be necessary (these modifications make the encryption about twice slower). We prove lower bounds on the transparency order of highly nonlinear S-boxes. We show that some highly nonlinear functions (in odd or even numbers of variables) have very bad transparency orders: the inverse functions (used as S-box in the AES), the Gold functions and the Kasami functions (at least under some assumption).
ePrint: https://eprint.iacr.org/2005/387
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