¹ Department of Computer Science ,Northwest Normal University ,Lanzhou, Gansu,China, 730070
² Department of Computer Science, Georgia State University, Atlanta, Georgia 30303
³ School of Information Science and Engineering , Lanzhou University, Lanzhou, Gansu,China, 730000

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Abstract—ID-based public key cryptography is proposed to simplify the management of the certification process and greatly reduce the public key authentication computation as well as communication cost. Certified e-mail protocol is a fair exchange of a message for a receipt between two potentially mistrusting parties over the network. A number of certified e-mail protocols have been studied in recent years. However, most of those protocols used certificated-based cryptography and the the full trusted third party employed ,may not be suitable for wireless networks that own limited resources such as power, computation and bandwidth . In this paper, we propose an improved identity-based signcryption with re-encryption scheme firstly ,then based on the scheme, we develop a novel certified e-mail protocol in Id-based setting that employs an off-line semi-trusted third party STTP for wireless networks ,finally the detailed analysis shows that the proposed approach is dynamic, lightweight and scalable.

Index Terms—Certified e-mail protocol, ID-based cryptography, Signcryption with proxy re-encrypt, Wireless networks.

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Cite: Caifen Wang,Caihui Lan,Shufen Niu, Xiaojun Cao, and Minan Gong, " An ID-Based Certified E-mail protocol with STTP Suitable for wireless mobile environments," Journal of Computers vol. 8, no. 1, pp. 3-9, 2013.