Welcome to the resource topic for 2014/151
Title:
Security Analysis of Key-Alternating Feistel Ciphers
Authors: Rodolphe Lampe, Yannick Seurin
Abstract:We study the security of \emph{key-alternating Feistel} ciphers, a class of key-alternating ciphers with a Feistel structure. Alternatively, this may be viewed as the study of Feistel ciphers where the pseudorandom round functions are of the form F_i(x\oplus k_i), where k_i is the (secret) round key and F_i is a \emph{public} random function that the adversary is allowed to query in a black-box way. Interestingly, our results can be seen as a generalization of traditional results \emph{à la} Luby-Rackoff in the sense that we can derive results for this model by simply letting the number of queries of the adversary to the public random functions F_i be zero in our general bounds. We make an extensive use of the coupling technique. In particular (and as a result of independent interest), we improve the analysis of the coupling probability for balanced Feistel schemes previously carried out by Hoang and Rogaway (CRYPTO 2010).
ePrint: https://eprint.iacr.org/2014/151
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