改进的代理环签名方案

Improved proxy ring signature scheme

对Luo提出的代理环签名方案分析发现该方案不具备不可伪造性,攻击者无须原始签名人的代理授权能够伪造出一个有效的代理环签名。为了防止这种伪造攻击,基于双线性对和GDH群,通过修正代理环签名的签名算法和相应的验证等式提出一个改进方案。安全分析表明改进方案克服了原方案的安全缺陷,满足代理环签名的所有安全要求,而且改进方案保持了原方案计算效率高的优点。

By analyzing the proxy ring signature scheme proposed by Luo,it was found that the scheme did not possess unforgeability,because an accacker without the proxy authorzation of original signer could forge a valid proxy ring signarue.To prevent this forgery attack,by changing signataure algorithm and the corresponding verification equation of proxy ring signarue,this paper proposed an improved scheme based on bilinear pairings and gap Diffie-Hellman group.The security analysis proves that the imporved scheme overcomes the security defect of original scheme and satisfies all security requirements of proxy ring signarue.Furthermore,it retains the merit of high computing efficiency in the original scheme.