Access-based Lightweight Physical Layer Authentication for the Internet of Things Devices
arxiv(2023)
摘要
Physical-layer authentication is a popular alternative to the conventional
key-based authentication for internet of things (IoT) devices due to their
limited computational capacity and battery power. However, this approach has
limitations due to poor robustness under channel fluctuations, reconciliation
overhead, and no clear safeguard distance to ensure the secrecy of the
generated authentication keys. In this regard, we propose a novel, secure, and
lightweight continuous authentication scheme for IoT device authentication. Our
scheme utilizes the inherent properties of the IoT devices' transmission model
as its source for seed generation and device authentication. Specifically, our
proposed scheme provides continuous authentication by checking the access time
slots and spreading sequences of the IoT devices instead of repeatedly
generating and verifying shared keys. Due to this, access to a coherent key is
not required in our proposed scheme, resulting in the concealment of the seed
information from attackers. Our proposed authentication scheme for IoT devices
demonstrates improved performance compared to the benchmark schemes relying on
physical channels. Our empirical results find a near threefold decrease in the
misdetection rate of illegitimate devices and close to zero false alarm rate in
various system settings with varied numbers of active devices up to 200 and
signal-to-noise ratio from 0 dB to 25 dB. Our proposed authentication scheme
also has a lower computational complexity of at least half the computational
cost of the benchmark schemes based on support vector machine and binary
hypothesis testing in our studies. This further corroborates the practicality
of our scheme for IoT deployments.
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