Title: Cryptanalysis and enhancements of delegation-based authentication protocol for secure roaming service

Authors: Yichen Wang; Qiong Pu; Shuhua Wu

Addresses: Department of Computer Science and Software Engineering, Xi’an Jiaotong-Liverpool University, No. 111 Ren’ai Road, Suzhou Dushu Lake Higher Education Town, Suzhou Industrial Park, Jiangsu Province, Suzhou, 215123, China. ' CIMS Research Centre, Tongji University, No. 4800 Caoan Road, Jiading District, Shanghai, 201804, China. ' Department of Networks Engineering, Information Engineering University, Zhengzhou Mailbox 1001, No. 770, He'nan Province, 450002, China; State Key Laboratory of Information Security, Graduate University of Chinese Academy of Sciences Yuquan Road,19A, Beijing, 100049, China

Abstract: Most recently, Youn and Lim proposed an improved delegation-based authentication protocol for secure roaming service with unlinkability. In this letter, we show that: 1) it is vulnerable to a denial of service (DoS) attack; 2) cannot provide the unlinkability as claimed. Finally, we propose an enhanced protocol to remedy the security loopholes existing in it. Moreover, our improved protocol is still efficient.

Keywords: security; delegation-based authentication protocols; unlinkability; DoS attacks; denial of service; portable communication systems; PCSs; cryptanalysis; cryptography; secure roaming services.

DOI: 10.1504/IJESDF.2012.049755

International Journal of Electronic Security and Digital Forensics, 2012 Vol.4 No.4, pp.252 - 260

Received: 03 Nov 2011
Accepted: 27 Feb 2012

Published online: 19 Nov 2014 *

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