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2015 | OriginalPaper | Buchkapitel

Security Analysis of Key-Alternating Feistel Ciphers

verfasst von : Rodolphe Lampe, Yannick Seurin

Erschienen in: Fast Software Encryption

Verlag: Springer Berlin Heidelberg

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Abstract

We study the security of 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 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 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).

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Fußnoten
1
Note that whether \(x^{\ell +1}_{i-1}\) and \(x^j_{i-1}\) are distinct or not depends on \(\cap _{s\in S} A_s\), so that the event \(x^{\ell +1}_i=x^j_i\) is not independent from \(\cap _{s\in S} A_s\).
 
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Metadaten
Titel
Security Analysis of Key-Alternating Feistel Ciphers
verfasst von
Rodolphe Lampe
Yannick Seurin
Copyright-Jahr
2015
Verlag
Springer Berlin Heidelberg
DOI
https://doi.org/10.1007/978-3-662-46706-0_13

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