| Summary: | In recent years, the Internet of things (IoT) has become an encouraging communication paradigm that has numerous applications including smart city, smart home and intelligent transportation system. The information sensed by several IoT smart devices can be security stored at the (cloud) servers. An external user, being a client, can access the services from a server for the sensing information, provided that a mutual authentication happens among them. Using the established session key among the user and the server, encrypted information with the help of session key can be delivered to the user by the server securely. Recently, Rana <italic>et al.</italic> proposed a smart-card based remote user authentication scheme using user password. In this comment paper, we carefully analyzed the scheme of Rana <italic>et al.</italic> and tracked down that their scheme is insecure against serious attacks, including stolen smart card attack, privileged-insider attack, user impersonation attack, password change attack and Ephemeral Secret Leakage (ESL) attack. Furthermore, their scheme does not preserve untraceability feature. To remedy these security pitfalls, we also provide some remedies that can help in building more secure and effective user authentication scheme to apply in securing next generation IoT infrastructure.
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