Enhanced delegation-based authentication protocol for PCSs

Authors:
Tian-Fu Lee;Shu-Hui Chang;Tzonelih Hwang;Song-Kong Chong
Affiliations:
Department of Computer Science and Information Engineering, National Cheng Kung University and Department of Computer Science and Applications, Leader University, Tainan City, Taiwan, R.O.C.;Department of Computer Science and Information Engineering, National Cheng Kung University and Center for General Education, Southern Taiwan University, Tainan County, Taiwan, R.O.C.;Department of Computer Science and Information Engineering, National Cheng Kung University, Tainan City, Taiwan, R.O.C.;Department of Computer Science and Information Engineering, National Cheng Kung University, Tainan City, Taiwan, R.O.C.
Venue:
IEEE Transactions on Wireless Communications
Year:
2009

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Abstract

Lee and Yeh recently presented a delegation-based authentication protocol for portable communication systems (PCSs), which is claimed to provide non-repudiation in on-line authentication. This investigation indicates that their protocol has a weakness in that a malicious visited location register can forge the authentication messages in off-line authentication processes, preventing mobile users from obtaining non-repudiation in such processes. This study also presents an enhanced protocol, which not only has the same security properties as the original protocol but also avoids the weakness in the original scheme and reduces the computational cost.