Abstract
AbstractRIPEMD-128 is an ISO/IEC standard cryptographic hash function proposed in 1996 by Dobbertin, Bosselaers and Preneel. The compression function of RIPEMD-128 consists of two different and independent parallel lines denoted by line1 operation and line2 operation. The initial values and the output values of the last step of the two operations are combined, resulting in the final value of one iteration. In this paper, we present collision differential characteristics for both line1 operation and line2 operation by choosing a proper message difference. By using message modification technique seriously, we improve the probabilities of the differential characteristics so that we can give a collision attack on 40-step RIPEMD-128 with a complexity of 235 computations.KeywordsHash functioncollisionsRIPEMD-128differential characteristicmessage modification
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