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Title:
A Tweak for a PRF Mode of a Compression Function and Its Applications
Authors: Shoichi Hirose, Atsushi Yabumoto
Abstract:We discuss a tweak for the domain extension called Merkle-Damgård with Permutation (MDP), which was presented at ASIACRYPT 2007. We first show that MDP may produce multiple independent pseudorandom functions (PRFs) using a single secret key and multiple permutations if the underlying compression function is a PRF against related-key attacks with respect to the permutations. Using this result, we then construct a hash-function-based MAC function, which we call FMAC, using a compression function as its underlying primitive. We also present a scheme to extend FMAC so as to take as input a vector of strings.
ePrint: https://eprint.iacr.org/2016/638
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