Fair E-payment protocol based on certificateless signature and authenticated key exchange

Authors:
Ming Chen;Kaigui Wu;Jie Xu
Affiliations:
College of Computer, Chongqing University, Chongqing, China;College of Computer, Chongqing University, Chongqing, China;College of Computer, Chongqing University, Chongqing, China and School of Computing, University of Leeds, UK
Venue:
ICICA'10 Proceedings of the First international conference on Information computing and applications
Year:
2010

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Abstract

E-payment protocol allows two or more users to securely exchange e-cash and digital product among them over an open network. There are some problems in the E-payment applications of cross-domain and cross-organization scenarios because of certificate-based authentication and digital signature, like inconsistent public key certificates and a heavy certificate management burden. ID-based cryptography is adopted to solve those problems, but it suffers the key escrow issue. Certificateless cryptography has been introduced to mitigate those limitations. A certificateless signature and authenticated key exchange scheme (CL-SAKE for short) is proposed, and its security is proved in the extended random oracle model. As an application, an E-payment protocol based on the new CL-SAKE is then proposed, which achieves unforgeability and unreusability of e-cash, customer anonymity and fair exchange.