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How to break MD5 and other hash functions
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(Second) preimage attacks on step-reduced RIPEMD/RIPEMD-128 with a new local-collision approach
CT-RSA'11 Proceedings of the 11th international conference on Topics in cryptology: CT-RSA 2011
Preimage attacks on full-ARIRANG
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Preimage attacks on Full-ARIRANG: analysis of DM-Mode with middle feed-forward
WISA'11 Proceedings of the 12th international conference on Information Security Applications
Distinguishers beyond three rounds of the RIPEMD-128/-160 compression functions
ACNS'12 Proceedings of the 10th international conference on Applied Cryptography and Network Security
Differential attacks on reduced RIPEMD-160
ISC'12 Proceedings of the 15th international conference on Information Security
Collision attacks on the reduced dual-stream hash function RIPEMD-128
FSE'12 Proceedings of the 19th international conference on Fast Software Encryption
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This paper presents the first results on the preimage resistance of ISO standard hash functions RIPEMD-128 and RIPEMD-160. They were designed as strengthened versions of RIPEMD. While preimage attacks on the first 33 steps and intermediate 35 steps of RIPEMD (48 steps in total) are known, no preimage attack exists on RIPEMD-128 (64 steps) or RIPEMD-160 (80 steps). This paper shows three variations of attacks on RIPEMD-128; the first 33 steps, intermediate 35 steps, and the last 32 steps. It is interesting that the number of attacked steps for RIPEMD-128 reaches the same level as RIPEMD. We show that our approach can also be applied to RIPEMD-160, and present preimage attacks on the first 30 steps and the last 31 steps.