proxy signature的用法和样例：
例句
- A threshold proxy signature scheme was presented with bilinear pairings.
摘要给出一种基于配对双线性映射的门限代理签名方案。 - One can forge an effective proxy signature that will be accepted by the signature verifier and that will not identify the true signer to management.
该攻击能够伪造出有效的代理签名，使签名验证人可以接受该代理签名，但管理中心并不能通过此签名来辨认出代理签名人的身份。
