中文摘要：

为了避免基于身份密码系统中的密钥托管问题和传统公钥密码的证书管理问题,利用双线性对,提出了一种无证书代理签名方案.基于计算Diffie-Hellman困难问题假定,在随机预言模型下证明了方案的安全性.与已有的同类方案的性能进行了比较,结果表明提出的方案在计算代价和通信代价上有一定的优势.

英文摘要：

In order to avoid the key escrow problem in identity based cryptosystem and the certificate managementproblem in traditional public key cryptosystem,we propose a certificateless proxy signature from bilinear pairing.Based on assumption of the computational Diffie-Hellman hardness problem,our scheme is proved secure in randomoracle model.Compared with the existing certificateless proxy signature schemes,the proposed scheme has advantagein both computation cost and communication cost.