Welcome to the resource topic for 2014/305
Title:
Collision Attack on 5 Rounds of Grøstl
Authors: Florian Mendel, Vincent Rijmen, Martin Schläffer
Abstract:In this article, we describe a novel collision attack for up to 5 rounds of the Grøstl hash function. This significantly improves upon the best previously published results on 3 rounds. By using a new type of differential trail spanning over more than one message block we are able to construct collisions for Grøstl on 4 and 5 rounds with complexity of 2^{67} and 2^{120}, respectively. Both attacks need 2^{64} memory. Due to the generic nature of our attack we can even construct meaningful collisions in the chosen-prefix setting with the same attack complexity.
ePrint: https://eprint.iacr.org/2014/305
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