标准模型下基于身份的高效多签密方案  

An Efficient Identity-based Multi-signcryption in Standard Model

作　　者：黄海[1] 祁正华[1] 杨红尘 

机构地区：[1]南京邮电大学计算机学院,江苏南京210003

出　　处：《计算机技术与发展》2016年第12期122-126,共5页Computer Technology and Development

基　　金：国家自然科学基金资助项目(61073188)

摘　　要：签密能够同时实现加密和认证功能,并且其计算代价小于传统的将两者组合使用的方式。所以用标准模型来构建高效安全的基于身份的签密方案是当下密码学领域的热点问题之一。该方案利用椭圆曲线上的双线性对,构建了将标准模型下基于身份的加密算法同多接收者情况下的签名算法两者优点相结合的基于身份的多接收者签密方案构架和安全概念,形成了具有安全、高效性的多接收者签密方案。针对现有基于身份的多签密方案存在效率不高的问题,提出了一种高效的基于身份的多签密方案。新方案在参与签密者人数为n(n>1)时减少了大量的幂运算,并在标准模型下进行了安全性分析及效率分析,证明了新方案可归约于CDH困难假定以及计算量的减少。与原有方案相比,在保证安全性的同时,多签密效率有了大幅提高。Signcryption can achieve encryption and signature at the same time, and less computational complexity than the traditional secure schemes that fulfill the functions both. Therefore it becomes one of the hottest topics in today＇ s cryptography to construct a secure and efficient Identity -Based Signature （ IBS ） under standard model. In the 1BS, identity-based encryption algorithm and multi-receiver signature algorithm are combined with bilinear pairing on elliptic curves to establish the structure and security concept of ID-based signcryption scheme for multiple receivers, forming an efficient identity-based multi signcryption. In view of the low efficiency of existing identity-based multi-signcryption, an efficient identity-based multi-signcryption algorithm is proposed, and it reduces the amount of power operation when the number of the signcrypter is n（n 〉 1 ） and gives the security and efficiency analysis in the standard model. It has proved that the new scheme＇ s secure under CDH assumption and reduces the calculation. Compared with the original scheme, the signcryption efficiency has been significantly improved.

关 键 词：基于身份 多签密 标准模型 双线性对 

分 类 号：TP301[自动化与计算机技术—计算机系统结构]