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Publication Citation: Practical Near-Collisions for Reduced Round Blake, Fugue, Hamsi and JH

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Author(s): Meltem Sonmez Turan; Erdener Uyan;
Title: Practical Near-Collisions for Reduced Round Blake, Fugue, Hamsi and JH
Published: August 23, 2010
Abstract: A hash function is near-collision resistant, if it is hard to find two messages with hash values that differ in only small number of bits. In this study, we used hill climbing methods to find near-collisions for some of the second round SHA-3 candidates. We practically obtained (i) 72-bit near-collision for the 2-round compression function of Blake-32; (ii) 64-bit near-collision for the 2-round compression function of Hamsi-256; (iii) 212-bit near-collisions for 10-round compression function of JH. For the reduced versions of F-256 function in Fugue, collisions and near collisions are observed.
Conference: The Second SHA-3 Candidate Conference
Pages: 13 pp.
Location: Santa Barbara, CA
Dates: August 23-24, 2010
Keywords: Hash functions; Near-collisions; SHA-3 Competition
Research Areas: Math, Computer Security