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中文摘要：
分析了一种无证书代理签名方案，指出其针对于无证书密码系统中的两类敌手都不安全。类型I敌手可替换用户的公钥来伪造代理授权和代理签名；类型II敌手（KGC）可针对预先选择好的用户生成特殊的系统参数，然后伪造代理授权。为了克服这些安全问题，提出了一种改进的方案，分析表明，新方案具有更好的安全性。
英文摘要：
This paper analyzes a certificateless proxy signature scheme and points out it are vulnerable against two types of adversaries in certificateless cryptosystems. Type I adversary can replace the user’public key to forge proxy delega-tions from any original signer to any proxy signer and compute the proxy signature;type II adversary（KGC）can generate the trapdoor system parameters according to the identity information of a pre-selected target user and then forge the proxy delegations from the target user to other users. To overcome these security problems, a new improved proxy signature scheme is proposed. Analysis shows that the new scheme has better security.
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