对无证书代理签名方案进行安全性分析，指出该方案对于公钥替换攻击是不安全的，并给出具体的攻击方法。
This paper analyzes the security of a certificateless proxy signature scheme and shows that it is insecure against the public key replacement attack in certificateless cryptosystems.
当前的代理盲签名都是基于身份或证书的，需要可靠的第三方认证，而无证书公钥系统却克服了这种缺点。
The current proxy blind signature are based on the identity or certificate, needing reliable third-party authentication. Public key system without the certificate has to overcome this shortcoming.
基于CL- PK C提出了两个安全的无证书环签名方案和无证书环代理签名方案。
Two secure schemes of certificateless ring-signature and certificateless ring proxy signature based on CL-PKC are proposed.
无证书的代理签名方案在保留基于身份的代理签名不需要证书的优点下，成功地解决了基于身份的代理签名方案中的密钥托管问题。
In order to eliminate the use of certificates in traditional proxy signature and the key-escrow problem in identity-based proxy signature, the notion of certificateless proxy signature was introduced.
在结合无证书密码体制的优点与代理签名的有关知识时，本文还给出了一种代理签名的无证书数字签名。
Based on the merits of the Certificateless Public Key Cryptography and combine the proxy signature, we give a proxy signature schemes and its' secure is also based on the DLP.
在结合无证书密码体制的优点与代理签名的有关知识时，本文还给出了一种代理签名的无证书数字签名。
Based on the merits of the Certificateless Public Key Cryptography and combine the proxy signature, we give a proxy signature schemes and its' secure is also based on the DLP.
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