基于离散对数的代理盲签名方案

通过对Tan等人的基于离散对数的代理盲签名方案进行分析，指出该方案不满足不可伪造性，利用一般性的伪造攻击方法，原始签名人和签名接收者都可以伪造一个有效的签名，同时当签名被公开后，代理签名人可以将盲消息的签名和消息签名联系起来，即签名是可追踪的。在此基础上提出了一种新方案，新方案不仅克服了原方案存在的安全缺陷，还具备签名速度快的特性。

Proxy blind signature scheme based on DLP

The proxy blind signature scheme based on DLP proposed by Tan et al. was analyzed, and it was found that this scheme does not possess the unforgeability. The original signer and the receiver could both forge a valid proxy blind signature for any message. At the same time, the proxy signer could make a linkage between a message signature and the corresponding blind message signature, which was called linkability. So an improved proxy blind signature scheme was proposed in this paper, which can not only resolved the security problems existing in the original scheme, but also has high efficiency.