A strongly secure pairing-free certificateless authenticated key agreement protocol under the CDH assumption

作     者：Haiyan SUN Qiaoyan WEN Wenmin LI 

作者机构：State Key Laboratory of Networking and Switching TechnologyBeijing University of Posts and Telecommunications Zhengzhou University of Light Industry 

出 版 物：《Science China(Information Sciences)》 (中国科学:信息科学(英文版))

年 卷 期：2016年第59卷第3期

页      面：107-122页

核心收录：

学科分类：0810[工学-信息与通信工程] 0808[工学-电气工程] 08[工学] 0839[工学-网络空间安全] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：supported by National Natural Science Foundation of China(Grant Nos.61300181 61502044 61502436) Fundamental Research Funds for the Central Universities(Grant No.2015RC23) 

主　　题：CDH assumption se CK model pairing certificateless cryptography authenticated key agreement 

摘      要：Certificateless authenticated key agreement(CL-AKA) protocols have been studied a great deal since they neither suffer from a heavy certificate management burden nor have the key escrow problem. Recently, many efficient CL-AKA protocols without pairings have been built. However, these pairing-free CL-AKA protocols are either not proved in any formal security model or proved under the gap Diffie-Hellman(GDH)assumption, a non-standard and strong assumption. With available implementation technologies, pairings are needed to realize the GDH assumption, which means that these pairing-free CL-AKA protocols are not pure pairing-free. Furthermore, these protocols are insecure in the strengthened e CK(se CK) model, which encompasses the e CK model and considers leakages on intermediate results. In this paper, we present a pure pairing-free CL-AKA protocol, which is provably secure in the se CK model under the standard computational Diffie-Hellman(CDH) assumption. Compared with the existing CL-AKA protocols, the proposed protocol has advantage over them in security or efficiency.