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Introduction Cryptographichashfunctions[1-3]areimportant cryptographicprimitivesandusedinauthentica-tion,non-repudiation,electroniccommerceand encryptionschemes.Cryptographichashfunctions havetosatisfyrequirementsofonewaynessand collisionresistance[4-7].Onesuchfamilyofhash functionsistheMDxfamily.Thisfamilyincludes hashfunctionssuchasMD5,SHA-1and RIPEMD-160.TheMD5hashfunctionwasproposedby Rivest[2].AnattackonMD5waspresentedby Wang[8].Butthedetailofattackalgorithmwasnot discovereduntil… 相似文献
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