CAJ | 학술논문

通过对夏祥盛等人的动态门限群签名方案的研究,指出该方案的若干不足,其中最主要的不足是通过伪造和不可追踪性,并对该方案进行了改进.与现有群签名方案不同,新方案中用户的秘密数由用户自己选取,从而避免了双线性对的计算,大大提高了效率.分析说明改进的群签名方案几乎克服了原方案的所有缺点.
통과대하상성등인적동태문한군첨명방안적연구,지출해방안적약간불족,기중최주요적불족시통과위조화불가추종성,병대해방안진행료개진.여현유군첨명방안불동,신방안중용호적비밀수유용호자기선취,종이피면료쌍선성대적계산,대대제고료효솔.분석설명개진적군첨명방안궤호극복료원방안적소유결점.
We investigate the security of a dynamic threshold group signature scheme proposed by Xia et al.,and point out several weaknesses of their scheme.The most serious weaknesses are universal forging and untraceability.We aslo improve their scheme.In our scheme,user's secret is chosen by himself.And there no bilinear pairing operations during the whole scheme,though the security of our scheme is based on elliptic curve discrete logarithm problem.Analysis shows that new scheme conquers almost all weaknesses of the old one.Our scheme is secure and efficient.