Cryptanalysis of LASH

Steinfeld, Ron, Contini, Scott, Matusiewicz, Krystian, Pieprzyk, Josef, Guo, Jian, Ling, San, & Wang, Huaxiong (2008) Cryptanalysis of LASH. Lecture Notes in Computer Science : Fast Software Encryption, 5086, pp. 207-223.

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We show that the LASH-x hash function is vulnerable to attacks that trade time for memory, including collision attacks as fast as 2(4x/11) and preimage attacks as fast as 2(4x/7). Moreover, we briefly mention heuristic lattice based collision attacks that use small memory but require very long messages that are expected to find collisions much faster than 2 x/2. All of these attacks exploit the designers’ choice of an all zero IV.

We then consider whether LASH can be patched simply by changing the IV. In this case, we show that LASH is vulnerable to a 2(7x/8) preimage attack. We also show that LASH is trivially not a PRF when any subset of input bytes is used as a secret key. None of our attacks depend upon the particular contents of the LASH matrix – we only assume that the distribution of elements is more or less uniform.

Impact and interest:

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ID Code: 69384
Item Type: Journal Article
Refereed: Yes
Keywords: Cryptanalysis, LASH
DOI: 10.1007/978-3-540-71039-4_13
ISSN: 0302-9743
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2008 Springer-Verlag Berlin Heidelberg
Deposited On: 27 Mar 2014 23:11
Last Modified: 17 Jul 2014 00:13

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