一种基于多线性映射的签密方案  

A Signcryption Scheme from Multilinear Maps

作　　者：陈飞[1,2] 韩益亮[1,2] 杨晓元[1,2] 汪晶晶[1,2] 

机构地区：[1]网络与信息安全武警部队重点实验室,陕西西安710086 [2]武警工程大学电子技术系,陕西西安710086

出　　处：《武汉大学学报（理学版）》2016年第2期165-170,共6页Journal of Wuhan University:Natural Science Edition

基　　金：国家自然科学基金资助项目(61572521;61272492);陕西省自然科学基础研究计划项目(2015JM6353)

摘　　要：为克服身份基公钥密码体制中存在的密钥托管问题,降低密文规模及计算代价,利用多线性映射构造了无证书体制下的签密新方案,在随机预言机模型下利用多线性Diffie-Hellman假设证明了机密性和不可伪造性.与已有方案相比,本文方案在密文长度相当的情况下,解签密计算上减少一次双线性对运算,提高了解签密效率.In order to solve the key escrow problem which exist in identity-based cryptography and reduce the length of ciphertext,the scheme exploited multilinear maps to construct a new certificateless signcryption,and it was proved to be confidential and unforgeable under the assumption of multilinear Diffie-Hellman problem.The scheme met the requirement of safety.Compared with existing schemes,it reduced a bilinear pairing operation in unsigncryption when the length of the ciphertext is almost the same,and advanced the efficiency of unsigncryption.

关 键 词：多线性对 无证书 签密 随机预言机 密钥托管 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]