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Preimage Attack on Hash Function RIPEMD

  • Gaoli Wang
  • Shaohui Wang
Part of the Lecture Notes in Computer Science book series (LNCS, volume 5451)

Abstract

RIPEMD is a cryptographic hash function devised in the framework of the RIPE project (RACE Integrity Primitives Evaluation, 1988-1992). It consists of two parallel lines, and each line is identical to MD4 except for some internal constants. It has been broken by the collision attack, but no preimage attack was given. In this paper, we give a preimage attack on the compression function of the 26-step reduced RIPEMD with complexity 2110 compression function computations, and we extend the attack on the compression function to an attack on the 26-step reduced RIPEMD with complexity 2115.2 instead of 2128. Then we extend the attack on 26 steps to the attack on 29 steps with the same complexity. Moreover, we can reduce the complexity of the preimage attack on the full RIPEMD without the padding rule by 1 bit compared with the brute-force attack.

Keywords

hash function RIPEMD cryptanalysis preimage attack 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  • Gaoli Wang
    • 1
  • Shaohui Wang
    • 2
  1. 1.School of Computer Science and TechnologyDonghua UniversityShanghaiChina
  2. 2.Nanjing University of Posts and TelecommunicationsNanjingChina

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