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Наслов: On a conditional collision attack on nasha-512
Authors: Markovski, Smile 
Mileva, Aleksandra 
Dimitrova, Vesna 
Gligoroski, Danilo
Issue Date: 2009
Journal: Cryptology ePrint Archive
Abstract: A collision attack on NaSHA-512 was proposed by L. Ji et al. The claimed complexity of the attack is 2192. The proposed attack is realized by using a suitable differential pattern. In this note we show that the correct result that can be inferred from their differential pattern is in fact a conditional one. It can be stated correctly as follows: A collision attack on NaSHA-512 of complexity k = 1, 2, . . . , 2 320 can be performed with an unknown probability of success pk, where 0 ≤ p1 ≤ p2 ≤ p2 320 ≤ 1. Consequently, the attack proposed by L. Ji et al. can be considered only as a direction how a possible collision attack on NaSHA-512 could be realized. The birthday attack remains the best possible attack on NaSHA-512.
URI: http://hdl.handle.net/20.500.12188/23871
Appears in Collections:Faculty of Computer Science and Engineering: Journal Articles

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