无需随机预言的无证书聚合签名方案

现有的聚合签名方案大多数是在传统公钥密码体制或者基于身份的密码体制提出的,都存在证书的管理问题和密钥托管问题。最近Gong等人提出聚合签名是在无证书密码体制下的。然而,他们的方案是在随机预言模型下可证安全的。在无证书公钥密码体制的基础上提出了一个无需随机预言模型下的聚合签名方案。新方案不但具有不需要数字证书同时也不存在密钥托管问题的特点,并且还满足无证书聚合签名安全需求。此外与现存的无证书聚合签名方案相比,新方案在性能上具有明显的改进。

Certificateless aggregate signature scheme without random oracles

Most of the existing aggregate signature schemes are constructed under traditional Public Key Cryptography（PKC） or Identity-based（ID-based） systems,which have the problems of certificate management or key escrow.Recently,Gong et al have proposed two aggregate signature schemes under certificateless systems.However,the security of the aggregate signature schemes can only be shown in the random oracle model.In this paper,a new certificateless aggregate signature scheme without random oracles is proposed.The result shows that the new signature scheme solves all the problems of certificate management and key escrow,and also satisfies all the required characteristics of certificateless aggregate signature.The proposed scheme is more efficient than those of previous schemes.