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Erschienen in:
2009 | OriginalPaper | Buchkapitel
MD5 Is Weaker Than Weak: Attacks on Concatenated Combiners
verfasst von : Florian Mendel, Christian Rechberger, Martin Schläffer
Erschienen in: Advances in Cryptology – ASIACRYPT 2009
Verlag: Springer Berlin Heidelberg
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We consider a long standing problem in cryptanalysis: attacks on hash function combiners. In this paper, we propose the first attack that allows collision attacks on combiners with a runtime below the birthday-bound of the
smaller
compression function. This answers an open question by Joux posed in 2004.
As a concrete example we give such an attack on combiners with the widely used hash function MD5. The cryptanalytic technique we use combines a partial birthday phase with a differential inside-out technique, and may be of independent interest. This potentially reduces the effort for a collision attack on a combiner like MD5||SHA-1 for the first time.