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《Journal of Baoji University of Arts and Sciences(Natural Science Edition)》 2009-01
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Cryptanalysis and improvement of YTH threshold proxy signature scheme

HU Jiang-hong1,LI Zhe-feng2(1.Department of Mathematics,Baoji University of Arts and Sciences,Baoji 721013,Shaanxi,China;2.Editorial Department of Journals,Baoji University of Arts and Sciences,Baoji 721007,Shaanxi,China)  
Aim The security of YTH scheme,which was proposed by YANG C Y,TZENG S F and HWANG M S in 2004 was analyzed.Methods The original scheme was improved on the basis of the discrete logarithm problem and the secure one-way Hash function in finite field.Results Through analyzing the security of YTH scheme,The scheme was found to be vulnerable to public-key substitute attack.A new blind threshold proxy signature scheme with high safety and efficiency is proposed.Conclusion The improved scheme can not only avoid public-key substitute attack,but also has such properties threshold proxy signature and blind signature should have as unforgeability,non-repudiation.
【CateGory Index】: TP309
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