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C-Y Yang等人提出了一个安全性基于求解离散对数困难性的门限代理签名方案,该方案具有较少的通信量及较高的计算效率。基于数论知识分析该方案存在缺陷:不满足不可伪造性和不可否认性,提出了改进方案将代理密钥以门限的方式在成员间共享,使得每个成员的子代理密钥都包含个体随机数,其他成员无法获知某成员的子代理密钥。改进方案的安全性基于求解离散对数的困难性,能抵御密钥替换攻击,具备不可伪造性和不可否认性。
C-Y Yang et al. Proposed a security threshold proxy signature scheme based on the difficulty of solving discrete logarithms, which has less traffic and higher computational efficiency. Based on the theory of number theory, this scheme has some defects: it does not satisfy the unforgeability and non-repudiation, and proposes an improved scheme to share the proxy key among the members in a threshold way so that each member’s sub-agent key contains an individual random number , Other members can not know a member’s sub-agent key. Improving the security of the scheme is based on the difficulty of solving the discrete logarithm and can resist the key replacement attacks with unforgeability and non-repudiation.