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IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences 2008 E91-A(1):46-54; doi:10.1093/ietfec/e91-a.1.46
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Copyright © 2008 The Institute of Electronics, Information and Communication Engineers

Special Section on Cryptography and Information Security -- Papers -- Hash Functions

Improved Collision Search for Hash Functions: New Advanced Message Modification

Yusuke NAITO1,2, Kazuo OHTA1 and Noboru KUNIHIRO1

1 The authors are with the University of Electro-Communica-tions, Chofu-shi, 182-8585 Japan. E-mail: Naito.Yusuke{at}ce.MitsubishiElectric.co.jp, 2 Presently, with Mitsubishi Electric Corporation.


  Abstract

In this paper, we discuss the collision search for hash functions, mainly in terms of their advanced message modification. The advanced message modification is a collision search tool based on Wang et al.'s attacks. Two advanced message modifications have previously been proposed: cancel modification for MD4 and MD5, and propagation modification for SHA-0. In this paper, we propose a new concept of advanced message modification, submarine modification. As a concrete example combining the ideas underlying these modifications, we apply submarine modification to the collision search for SHA-0. As a result, we show that this can reduce the collision search attack complexity from 239 to 236 SHA-0 compression operations.

Key Words: hash function, collision attack, collision search, advanced message modification

Manuscript received March 22, 2007. Manuscript revised July 1, 2007.


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