Title: A privacy and delegation-enhanced user authentication protocol for Portable Communication Systems

Authors: Ren-Chiun Wang, Wen-Shenq Juang, Chin-Laung Lei

Addresses: Department of Electrical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei 106, Taiwan. ' Department of Information Management, National Kaohsiung First University of Science and Technology, No. 2, Jhuoyue Rd., Nanzih District, Kaohsiung 811, Taiwan. ' Department of Electrical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei 106, Taiwan

Abstract: Recently, Lee et al. proposed a security enhanced delegation-based authentication protocol for Portable Communication Systems (PCSs). The major merits include: 1) the privacy protection of Mobile User (MS); 2) MS can construct a digital signature to prove the requests; 3) the satisfaction of some security properties; 4) the mutual authentication between MS and the Visited Location Register (VLR); 5) low computation and communication cost of MS. We then show that the privacy of MS is not kept and the overcharge problem exists in Lee et al.|s protocol and propose a method to enhance the delegation and security level and to keep the same efficiency.

Keywords: user authentication; hash function; privacy protection; proxy signatures; wireless communications; portable communication systems; mobile communications; digital signatures; delegation levels; security levels.

DOI: 10.1504/IJAHUC.2010.034971

International Journal of Ad Hoc and Ubiquitous Computing, 2010 Vol.6 No.3, pp.183 - 190

Published online: 31 Aug 2010 *

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