An energy efficient remote user authentication scheme preserving user anonymity

Internet of Things (IoT), is an interconnection of heterogeneous devices in terms of computational, communication, energy efficient competences over public insecure communication channel called Internet. Through advancement in mobile and communication technologies, users can connect to remote servers ubiquitously through a ´thing´ or device which is a part of IoT. Insecure nature of Internet and resource constrained nature of devices or things which are part of IoT demands for remote user authentication protocols which are extremely secure, light weight and energy efficient. In this context, C.G MA et al proposed a new dynamic ID based authentication scheme. In this manuscript we will illustrate that C.G MA et al. scheme cannot preserve user anonymity under their hypothesis and susceptible to stolen verifier attack. In addition, we will confirm that their scheme is heavy weight and needs more energy. We then present our improved scheme which is a generalized one, which is secure, light weight and energy efficient, while protecting the merits of different dynamic identity based authentication schemes.