Toward pairing-free certificateless authenticated key exchanges

Authors:
Hu Xiong;Qianhong Wu;Zhong Chen
Affiliations:
Key Laboratory of Network and Software Security Assurance of the Ministry of Education, Institute of Software, School of Electronics Engineering and Computer Science, Peking University, Beijing, C ...;Key Lab. of Aerospace Information Security and Trusted Computing Ministry of Education, School of Computer, Wuhan University, China and Universitat Rovira i Virgili, Department of Computer Enginee ...;Key Laboratory of Network and Software Security Assurance of the Ministry of Education, Institute of Software, School of Electronics Engineering and Computer Science, Peking University, Beijing, C ...
Venue:
ISC'11 Proceedings of the 14th international conference on Information security
Year:
2011

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Abstract

Certificateless authenticated key exchange (CL-AKE) protocols do not suffer from intricate certificate management or heavy trust reliance on a third party. Unfortunately, these advantages are partially counteracted in most CL-AKE protocols which require expensive pairing operations. This paper proposes a new CL-AKE protocol without requiring any pairing operation during the protocol execution, although a pairing map may be required to realize a Decisional Diffie-Hellman (DDH) oracle in the security proof. With implicit authentication, we illustrate modular proofs in a security model incorporating standard definitions of AKE protocols and certificateless cryptography. Analysis shows that our protocol is also efficient.