Meet-in-the-Middle Preimage Attacks on Hash Modes of Generalized Feistel and Misty Schemes with SP Round Function

Dukjae MOON  Deukjo HONG  Daesung KWON  Seokhie HONG  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E95-A   No.8   pp.1379-1389
Publication Date: 2012/08/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E95.A.1379
Print ISSN: 0916-8508
Type of Manuscript: PAPER
Category: Cryptography and Information Security
preimage attack,  hash mode,  Feistel scheme,  Misty scheme,  block cipher,  

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We assume that the domain extender is the Merkle-Damgård (MD) scheme and he message is padded by a ‘1', and minimum number of ‘0' s, followed by a fixed size length information so that the length of padded message is multiple of block length. Under this assumption, we analyze securities of the hash mode when the compression function follows the Davies-Meyer (DM) scheme and the underlying block cipher is one of the plain Feistel or Misty scheme or the generalized Feistel or Misty schemes with Substitution-Permutation (SP) round function. We do this work based on Meet-in-the-Middle (MitM) preimage attack techniques, and develop several useful initial structures.