一种可证安全的PKI和IBC双向匿名异构签密方案的改进  

Improvement of a Provably Secure Mutual and Anonymous Heterogeneous Signcryption Scheme Between PKI and IBC

作　　者：曹素珍 郎晓丽 刘祥震 张玉磊 王彩芬 CAO Suzhen;LANG Xiaoli;LIU Xiangzhen;ZHANG Yulei;WANG Caifen(College of Computer Science and Engineering, Northwest Normal University, Lanzhou 730070, China)

机构地区：[1]西北师范大学计算机科学与工程学院

出　　处：《电子与信息学报》2019年第8期1787-1792,共6页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(61163038,61262056,61262057);甘肃省高等学校科研项目(2017A-003,2018A-207)~~

摘　　要：异构签密可以保证异构密码系统之间数据的机密性和不可伪造性。该文分析了一个传统公钥密码(PKI)和身份密码(IBC)之间的PKI→IBC和IBC→PKI双向匿名异构签密方案的安全性,指出PKI→IBC方案和IBC→PKI方案均不能抵挡敌手攻击,敌手在获取密文前提下均可解密密文。为了增强安全性,该文提出一个改进的PKI→IBC和IBC→PKI方案,并在随机预言模型下基于计算性Diffie-Hellman困难问题和双线性Diffie-Hellman困难问题证明新方案满足机密性与不可伪造性。同时效率分析表明,所提方案具有更高的通信效率。Heterogeneous signcryption can ensure the confidentiality and unforgeability of information data between different cryptosystems systems. Security for the traditional Public Key Infrastructure(PKI) and Identity-Based Cryptosystem(IBC) two-way and anonymous heterogeneous signcryption scheme between PKI→IBC and IBC→PKI is analyzed. It is pointed out that PKI→IBC scheme and IBC→PKI scheme can not resist adversary attacks. The ciphertext can be decrypted under the adversary obtaining the ciphertext. To enhance security, a new PKI→IBC and IBC→PKI scheme is proposed, and then confidentiality and unforgeability of the scheme in the random oracle model on the basis of the assumptions of Computational Diffie-Hellman problem and Bilinear Diffie-Hellman problem is proved. The efficiency analysis shows that the new scheme has higher communication efficiency.

关 键 词：异构签密 选择密文攻击 机密性 不可伪造性 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]