The security of the Internet of Things (IoT) is receiving considerable interest as the low\npower constraints and complexity features of many IoT devices are limiting the use of conventional\ncryptographic techniques. This article provides an overview of recent research efforts on alternative\napproaches for securing IoT wireless communications at the physical layer, specifically the key\ntopics of key generation and physical layer encryption. These schemes can be implemented and are\nlightweight, and thus offer practical solutions for providing effective IoT wireless security. Future\nresearch to make IoT-based physical layer security more robust and pervasive is also covered.
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