论文部分内容阅读
基于证书的密码体制既能降低公钥的管理费用又能解决密钥托管问题,代理签名可以让一个原始签名者在自己不方便亲自签名的情况下,委托他信任的代理人代替他签名.针对目前基于证书的代理签名方案普遍基于双线性对来实现因而效率不高和其安全模型不完善的问题,给出了新的基于证书的代理签名的安全模型,并提出一个不使用双线性对的基于证书的代理签名方案.在随机预言机模型中,基于椭圆曲线离散对数问题假设,对方案进行了不可伪造性的证明.最后,对方案的效率进行了比较,结果表明方案是高效的.
The certificate-based cryptosystem can not only reduce the administration cost of public key but also solve the key escrow problem. The proxy signature can let an original signer entrust his trusted agent to replace his signature if he is inconvenient to sign it by himself. At present, the certificate-based proxy signature scheme is generally based on bilinear pairings to achieve low efficiency and imperfect security model. A new certificate-based proxy signature security model is proposed, and a new scheme that does not use bilinear In the random oracle model, based on the hypothesis of elliptic curve discrete logarithm problem, the scheme is proved unforgeability.Finally, the efficiency of the scheme is compared and the results show that the scheme is efficient of.