基于自认证的多接受者签密方案

MULTI-RECIPIENT SIGNCRYPTION SCHEME BASED ON THE SELF-CERTIFICATION

多接收者签密和自认证公钥密码体制理论相结合,使得一个成员可以以广播的方式广播一个消息给多个接收者,而且无需公钥的单独认证.本文在研究文献的基础上,运用密码学分析方法,对一个自认证签密方案进行了安全性分析,发现原方案不满足不可伪造性的特征,并给出具体的攻击方法,提出了改进措施.通过改变签名方程中的参数因子的加入方法,得到了一个安全的可公开验证的基于双线性映射的多接收者签密方案,并给出新方案的安全性分析.分析表明:改进方案在保留原方案的特性的基础上,提高了方案的安全性能,而执行效率只比原方案增加一次加法运算和一次双线性对运算.可以用于不安全和开放网络环境中的敏感信息广播.

By Combing the theory of multi- recipient signcryption and the self-certificated public key cryptosystems, it makes a member broadcast a message to multiple recipients with no public key authentication separately. In this paper, on the basis of the literature research, using analysis method of cryptography, security analysis was carrid out for a sign secret to a self certification scheme and found that the original plan can not meet the needs of unforgeable characteristics, an specific attack methods was proposed, and then puts forward the improvement measures. By designing the way the parameter factors joining in the signature equation, we got a multi -veceiver public security verification scheme based on bilinear mapping, and the security of the new scheme is analyzed. Analysis shows that the new scheme on the basis of retaining the characteristics of the original plan has an improved searity performance and the execution efficiency compared to the original plan increases only one additive operation and bilinear pairings computation at a time.