Cryptology ePrint Archive: Report 2013/560

Sometimes-Recurse Shuffle: Almost-Random Permutations in Logarithmic Expected Time

Ben Morris and Phillip Rogaway

Abstract: We describe a security-preserving construction of a random permutation of domain size N from a random function, the construction tolerating adversaries asking all N plaintexts, yet employing just \Theta(lg N) calls, on average, to the one-bit-output random function. The approach is based on card shuffling. The basic idea is to use the \textit{sometimes-recurse} transformation: lightly shuffle the deck (with some other shuffle), cut the deck, and then recursively shuffle one of the two halves. Our work builds on a recent paper of Ristenpart and Yilek.

Category / Keywords: secret-key cryptography / Card shuffling, format-preserving encryption, PRF-to-PRP conversion, mix-and-cut shuffle, pseudorandom permutations, sometimes-recurse shuffle, swap-or-not shuffle

Date: received 3 Sep 2013

Contact author: rogaway at cs ucdavis edu

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Version: 20130904:142353 (All versions of this report)

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