Cryptanalysis of an authentication scheme for multi-gateway wireless sensor networks

Wireless sensor network has wide potential application in many fields such as military, agricultural and healthcare. However, it also has some vulnerabilities because of its openness. For this reason, many researchers have proposed various user authentication schemes for added security of wireless sensor networks. Recently, Wu et al. proposed an authentication scheme for multi-gateway wireless sensor networks in Internet of Things deployment. Wu et al. claimed that their scheme is secure against user forgery attack and session key leakage. However, we found that the scheme is vulnerable to outsider and user impersonation attacks. In this paper, we revisit Wu et al.'s scheme and analyze its vulnerabilities.