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Journal of Inforamtion Science and Engineering, Vol.15 No.4, pp.471-484 (July 1999)
A Novel Application of the Phone Card and
Its Authentication in Mobile Communications1

C. H. Lee, M. S. Hwang* and W. P. Yang
Department of Computer and Information Science
National Chiao Tung University
Hsinchu, Taiwan 300, R.O.C.
*Department of Information Management
Chao Yang University of Technology
Taichung, Taiwan 413, R.O.C.

The Subscriber Identity Module (SIM) is conventionally used in wireless communication systems. However, several limitations involving SIM significantly reduce public access in wireless communications. This study examined the feasibility of using public telephone cards in wireless communications. This novel application retains the merits of SIM. Among the relevent issues addressed are location tracking of the user, authentication of the phone card, and the billing scheme. Moreover, two implementations of phone card authentication are presented.

Keywords: authentication, billing system, location tracking, mobile communications, one-way function, phone card, public-key cryptography

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Received May 6, 1997; accepted November 21, 1997.
Communicated by Jean-Lien C. Wu.
1 Portions of this paper was presented at the 1997 The Seventh National Conference on Information Security, May, Taiwan, R.O.C.