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International Association for Cryptologic Research (IACR)
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
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