Password authentication with insecure communication
Communications of the ACM
Examining Smart-Card Security under the Threat of Power Analysis Attacks
IEEE Transactions on Computers
CRYPTO '99 Proceedings of the 19th Annual International Cryptology Conference on Advances in Cryptology
An Authentication Scheme for Ad-hoc Networks using Threshold Secret Sharing
Wireless Personal Communications: An International Journal
Privacy Analysis of Forward and Backward Untraceable RFID Authentication Schemes
Wireless Personal Communications: An International Journal
A new remote user authentication scheme using smart cards
IEEE Transactions on Consumer Electronics
A More Secure Authentication Scheme for Telecare Medicine Information Systems
Journal of Medical Systems
Security and Communication Networks
A Smart Card Based Efficient and Secured Multi-Server Authentication Scheme
Wireless Personal Communications: An International Journal
A New Password-Based Multi-server Authentication Scheme Robust to Password Guessing Attacks
Wireless Personal Communications: An International Journal
Journal of Medical Systems
Cryptanalysis and Improvement of an Anonymous Authentication Protocol for Wireless Access Networks
Wireless Personal Communications: An International Journal
Robust Smart Card Authentication Scheme for Multi-server Architecture
Wireless Personal Communications: An International Journal
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Recently, Wang and Ma (Wireless Pers Commun, 2012. doi: 10.1007/s11277-011-0456-7 ) proposed a smart card based authentication scheme for multi-server environment. They also demonstrated that their scheme could overcome various attacks. In this paper, the security of Wang et al.'s scheme is evaluated. Our analysis shows their scheme is vulnerable to the server spoofing attack, the impersonation attack, the privileged insider attack and the off-line password guessing attack.