一个安全高效的无证书签名方案的分析和改进

摘要

对刘倩等提出的一个无证书签名方案进行安全性分析.结果表明,方案存在公钥替换攻击,且方案使用了双线性对运算导致效率下降.在此基础上,提出一个新的不使用双线性对的无证书签名方案,并证明了方案可以抵抗两类攻击者的攻击.最后,将提出的改进方案与已有的无证书签名方案进行效率比较,发现新方案具有较高的效率.%The security analysis of the certificateless signature scheme proposed by Liu Qian et al. shows that the scheme is not secure for public key replacement attack and the efficiency of the scheme is low due to the usage of bilinear pairings. This paper proposes a new certificateless signature scheme without bilinear pairings on the basis of original scheme, and it is proved that the new scheme is secure for two types of attackers. After comparing the new scheme with existing signature schemes, it maintains that the new scheme is efficient.