中文摘要：

代理环签名可使代理者以匿名的方式进行代理签名，具有很多优点。首先给出无证书代理环签名方案的最强安全模型，并利用双线性映射提出一个高效的无证书代理环签名方案。在所定义的最强的安全模型下，方案给出了严格的安全证明，它的安全性基于计算Diffie—Hellman问题的困难性。分析显示该方案满足诸如无条件匿名性、强不可伪造性等安全性质。鉴于该方案的安全、高效和无证书管理的优点，它可广泛应用于电子政务、移动代理系统等方面。

英文摘要：

Proxy ring signature, which enables a proxy signer to anonymously sign a message on behalf the original signer, has many advantages. This paper firstly proposed the strongest security model of certificateless proxy ring signature schemes and gave an efficient construction of certificateless proxy ring signature scheme using bilinear maps, with rigorous security proofs in the proposed strongest security model. The security of the scheme was based on the infeasibility of the computational Diffie- Hellman problem. The analysis shows that the new scheme satisfies the security requirements such as unconditional anonymity, strong unforgeability for a proxy ring signature scheme. Due to its security, efficiency and free of certificate management, it may have practical applications in electronic government affairs and mobile agent systems, etc.