naa a22 4500 510796206 CHVBK 20180411083337.0 cr unu---uuuuu 180411e20130201xx s 000 0 eng 10.1007/s11277-012-0535-4 doi (NATIONALLICENCE)springer-10.1007/s11277-012-0535-4 An Enhanced Authentication Scheme with Privacy Preservation for Roaming Service in Global Mobility Networks [Elektronische Daten] [Qi Jiang, Jianfeng Ma, Guangsong Li, Li Yang] Global mobility network (GLOMONET) provides global roaming service to ensure ubiquitous connectivity for users traveling from one network to another. It is very crucial not only to authenticate roaming users, but to protect the privacy of users. However, due to the broadcast nature of wireless channel and resource limitations of terminals, providing efficient user authentication with privacy preservation is challenging. Recently, He et al. proposed a secure and lightweight user authentication scheme with anonymity for roaming service in GLOMONETs. However, in this paper, we identify that the scheme fails to achieve strong two-factor security, and suffers from domino effect, privileged insider attack and no password change option, etc. Then we propose an enhanced authentication scheme with privacy preservation based on quadratic residue assumption. Our improved scheme enhances security strength of He et al.'s protocol while inheriting its merits of low communication and computation cost. Specifically, our enhanced scheme achieves two-factor security and user untraceability. Springer Science+Business Media, LLC., 2012 Roaming nationallicence Authentication nationallicence Anonymity nationallicence Untraceability nationallicence Privacy nationallicence Jiang Qi School of Computer Science and Technology, Xidian University, Xi'an, China aut Ma Jianfeng School of Computer Science and Technology, Xidian University, Xi'an, China aut Li Guangsong Department of Information Research, Information Engineering University, Zhengzhou, China aut Yang Li School of Computer Science and Technology, Xidian University, Xi'an, China aut Wireless Personal Communications Springer US; http://www.springer-ny.com 68/4(2013-02-01), 1477-1491 0929-6212 68:4<1477 2013 68 11277 https://doi.org/10.1007/s11277-012-0535-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11277-012-0535-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Jiang Qi School of Computer Science and Technology, Xidian University, Xi'an, China aut NATIONALLICENCE 700 1- Ma Jianfeng School of Computer Science and Technology, Xidian University, Xi'an, China aut NATIONALLICENCE 700 1- Li Guangsong Department of Information Research, Information Engineering University, Zhengzhou, China aut NATIONALLICENCE 700 1- Yang Li School of Computer Science and Technology, Xidian University, Xi'an, China aut NATIONALLICENCE 773 0- Wireless Personal Communications Springer US; http://www.springer-ny.com 68/4(2013-02-01), 1477-1491 0929-6212 68:4<1477 2013 68 11277 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer