Key-Free Authentication Protocol Against Subverted Indoor Smart Devices for Smart Home

Smart homes are an increasingly common concept, particularly in technologically advanced countries. In these settings, the smart devices [also commonly referred to as the Internet of Things (IoT) devices] typically communicate via the radio frequency (RF) channel. In such an open communication channel, key establishment protocols are used to generate a session key between the command senders and the command receivers. The commands or messages are then encrypted using the session key. However, not all the smart home devices have sufficient computational capability to generate and store session keys. Therefore, in this article, we construct a communication protocol using the home limited channel (HLC). The protocol constructed in this article takes into account the existence of malicious indoor smart devices and the need to defend against such malicious indoor smart devices.