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Paper: Collisions for Round-Reduced LAKE

Authors:
Florian Mendel
Martin Schläffer
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URL: http://eprint.iacr.org/2008/109
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Abstract: LAKE is a family of cryptographic hash functions presented at FSE 2008. It is an iterated hash function and defines two main instances with a 256 bit and 512 bit hash value. In this paper, we present the first security analysis of LAKE. We show how collision attacks, exploiting the non-bijectiveness of the internal compression function of LAKE, can be mounted on reduced variants of LAKE. We show an efficient attack on the 256 bit hash function LAKE-256 reduced to 3 rounds and present an actual colliding message pair. Furthermore, we present a theoretical attack on LAKE-256 reduced to 4 rounds with a complexity of $2^{109}$. By using more sophisticated message modification techniques we expect that the attack can be extended to 5 rounds. However, for the moment our approach does not appear to be applicable to the full LAKE-256 hash function (with all 8 rounds).
BibTeX
@misc{eprint-2008-17786,
  title={Collisions for Round-Reduced LAKE},
  booktitle={IACR Eprint archive},
  keywords={cryptanalysis, hash functions, collision attack},
  url={http://eprint.iacr.org/2008/109},
  note={The final version of this paper has been published at ACISP 2008. martin.schlaeffer@iaik.tugraz.at 14105 received 11 Mar 2008, last revised 14 Aug 2008},
  author={Florian Mendel and Martin Schläffer},
  year=2008
}