Abstract
Internet of Things is a topic of much interest and, in last few years, security of the IoT systems is a field of tremendous research activities. Mutual authentication between IoT devices and IoT servers is an important part of secure IoT systems. Single password-based authentication mechanisms, which are widely used, are vulnerable to side-channel and dictionary attacks. In this paper, we present a multi-key (or multi-password) based mutual authentication mechanism. In our approach, the shared secret between the IoT server and the IoT device is called secure vault, which is a collection of equal sized keys. Initial contents of the secure vault are shared between the server and the IoT device and contents of the secure vault change after every successful communication session. We have implemented this mechanism on an Arduino device to prove our algorithm is feasible on IoT devices with memory and computational power constraints.
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