Cryptanalysis of a strong authentication scheme with user privacy for wireless sensor networks

Authentication and key agreement scheme is an important mechanism for legal users to access the services of wireless sensor network. However, the design of authentication and key agreement schemes in WSNs is still quite a challenging problem. In this paper, we analyze a strong authentication scheme with user privacy for WSNs proposed by Kumar et al. in 2013, and point out the scheme can not resist known session key attack, impersonation attack, sensor node capture attack and suffer from forward security problem, anonymity and untraceability problem.