标准模型下的无证书代理环签名方案

由于无证书公钥密码体制是一种新型公钥密码体制，它既克服了密钥托管问题，又不需要使用公钥证书，而在标准模型下所构造的方案与在随机语言模型下所构造的方案相比，具有更高的可证安全性，因此，该文在标准模型下，提出了一个无证书代理环签名方案。与现有的代理环签名方案相比，它具有更高的执行效率和可证安全性，能够归约于CDH（computational diffie-Hellman）问题假定。分析结果表明：它既能有效抵制来自密钥生成中心和授权人的伪造攻击，又能满足代理环签名的其他安全性需求；并且，该方案具有更高的执行效率，只需要两次对运算。

Certificateless Proxy Ring Signature Scheme in Standard Model

Since certificateless public key cryptography （CL-PKC for short） is a new type of public key cryptography, it eliminates the key escrow problem and the need for public key certificate. And the scheme in the standard model has more provable security than the scheme in the random oracle model （ROM）. So, it shows a certificateless proxy ring signature scheme in a standard model. Compared with the current proxy ring signature scheme, have the higher computing speed and more provable security, and have a security reduction to CDHP assumption. The analysis shows that it can resist forgery attacks from the secret key generation center and the original signer, and can satisfy the security requirements of a proxy ring signature scheme;meanwhile the computational efficiency is improved, the scheme only needs two bilinear parings.