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Stream/block ciphers, difference equations and algebraic attacks
[article]
2021
arXiv
pre-print
In this paper we model a class of stream and block ciphers as systems of (ordinary) explicit difference equations over a finite field. We call this class "difference ciphers" and we show that ciphers of application interest, as for example systems of LFSRs with a combiner, Trivium and Keeloq, belong to the class. By using Difference Algebra, that is, the formal theory of difference equations, we can properly define and study important properties of these ciphers, such as their invertibility and
arXiv:2003.14215v2
fatcat:kesf7divqbh4tdm6u7h6e3lqra