中文摘要：

针对强指定验证者签名的可委托性缺陷,分析了如何保证只有掌握指定验证者私钥的人才可以验证签名的有效性,通过改变方案验证等式的形式来避免此缺陷。基于椭圆曲线签名体制,提出了一个新的强指定验证者签名方案,该方案同时满足不可伪造性、不可传递性及不可委托性。通过合理设计验证等式的形式来构造安全签名方案的思路,提出构造具有不可委托性和不可伪造性的指定验证者签名的通用方法。此外,对Saeednia等人提出的SKM方案进行改进,新方案不存在可委托性缺陷。

英文摘要：

To avoid the problem of transferability of verification right, the way to ensure that only those who had designated verifier＇s private keys could verify the validity of signatures was researched. An ECC- based new designated verifier signature scheme was proposed, which could avoid the limitation of delegatability. It was supposed that whether a designated verifier signature possess non-delegatability could be judged by the format of the verifying equation. A general format was also proposed with which the designated verifier signature schemes could avoid the limitation of delegatability. Based on the idea above, a modification of the SKM scheme was made.