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Erschienen in:
2011 | OriginalPaper | Buchkapitel
(Second) Preimage Attacks on Step-Reduced RIPEMD/RIPEMD-128 with a New Local-Collision Approach
verfasst von : Lei Wang, Yu Sasaki, Wataru Komatsubara, Kazuo Ohta, Kazuo Sakiyama
Erschienen in: Topics in Cryptology – CT-RSA 2011
Verlag: Springer Berlin Heidelberg
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This paper uses new types of local collisions named
one-message-word local collisions
to construct meet-in-the-middle preimage attacks on two double-branch hash functions RIPEMD and RIPEMD-128, and obtains the following results.
1
A pseudo-preimage and second preimage attacks on the first 47 steps of RIPEMD (full version: 48 steps) are proposed with complexities of 2
119
and 2
124.5
compression function computations, respectively. The number of the attacked steps is greatly increased from previous preimage attacks on the first 33 steps and intermediate 35 steps.
2
A pseudo-preimage and preimage attacks on intermediate 36 steps of RIPEMD-128 (full version: 64 steps) are proposed with complexities of 2
123
and 2
126.5
compression function computations, respectively, while previous attacks can work at most intermediate 35 steps.