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无证书公钥密码体制既简化了传统公钥密码体制负担过重的密钥管理问题,又消除了基于身份的公钥密码体制所固有的密钥托管缺陷.基于无证书公钥密码体制提出一个高效的环代理签名方案,其成员私钥不再由密钥生成中心KGC单独产生,而由KGC和用户合作生成.安全性和有效性分析比较,该方案既具有环签名的无条件匿名性,原始签名人能匿名授权代理权限,又满足强代理签名的所有安全特性,能够有效抵制KGC的强伪造攻击;其环代理授权过程,不需要双线性对运算且标量乘运算代价较现有最优方案减少了一半,其效率具有明显优势,适用于需要匿名性且带宽受限的场合.
The certificateless public key cryptosystem not only simplifies the key management problem of the traditional public key cryptosystem but also eliminates the key escrow defect inherent in the identity-based public key cryptosystem. Based on the certificateless public key cryptosystem, Efficient ring proxy signature scheme, the member private key is no longer generated by the key generation center KGC alone, but by the KGC and user cooperation generated security and effectiveness analysis and comparison, the program has both the ring anonymous unconditional anonymity, the original The signer can anonymously authorize the agent’s authority and satisfy all the security features of the strong proxy signature, which can effectively resist the strong forgery attack of KGC. The ring proxy authorization process does not require bilinear pairwise operation and the scalar multiplication operation cost is higher than the existing optimality The solution has been cut in half and has obvious advantages in its efficiency. It is suitable for applications that require anonymity and limited bandwidth.