摘要
无证书签密是公钥密码体制的一个重要应用,与传统的先签名后加密相比,其计算量和通信成本都要低。借鉴国密SM2标准签名方案设计技巧,提出了一个新的基于无双线性对映射的无证书代理签密方案。随后对协议的正确性、安全性、参数选择和效率进行分析,在适应性选择消息和存在第二类攻击者给出了随机预言机模型下的安全性证明。新方案基于离散对数问题困难假设,由于避免了使用双线性对,因此性能良好;通过与其它方案的对比,计算开销明显低于其它签密方案,分析表明新方案具备较高安全性和效率。
Certificateless signcryption is one of the most important applications in certificateless public key cryp-tography. Compared with the traditional practice of signature before encryption, it has less costs for computationand communication. By reference to the signature scheme design skills in National Secret Algorithm SM2 Stan-dard, this paper proposes a certificateless agent signcryption scheme without pairing scheme. The analysis of itscorrectness, security, efficiency and parameter choice are subsequently presented, and a detailed formal securityproof in the random oracle model is given. The new scheme, based on the discrete logarithm problem（DLP） andDLP assumption, has significantly lower computational overhead than other certificateless agent signcryptionschemes. By avoiding the use of bilinear map, the proposed scheme shows better performance with higher securityand efficiency.
出处
《华东交通大学学报》
2015年第4期110-116,共7页
Journal of East China Jiaotong University
