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A Robust Physical Layer Key Generation Algorithm for Ultra-Wideband Ranging Process
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DOI：10.1109/LCOMM.2024.3466954.png)
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Abstract
En 中文
Ultra-wideband (UWB) technology has been widely used for low-cost accurate ranging and positioning. To ensure communication security, a secret key must be derived before every ranging session. However, this process introduces significant latency and requires additional hardware. Therefore, this letter proposes a low-cost physical layer key generation algorithm that leverages the characteristics of multi-path channels for authentication and encryption. By effectively utilizing channel impulse response (CIR) and channel features, the proposed approach significantly reduces the key disagreement rate (KDR). Moreover, a scrambled timestamp sequence (STS) assisted error correction method is also proposed to further reduce the KDR. Simulation results demonstrate that, for a 128-bit physical key, the proposed scheme achieves a 0.5% KDR and over 83% STS matching rate at a 10 dB Signal to Noise Ratio (SNR). By utilizing several generation processes, the proposed algorithm can efficiently generate the physical layer key during the ranging session.
Keywords:
Distance measurement
Delays
Physical layer
Protocols
Error correction
Channel estimation
Signal to noise ratio
Ultra-wideband
physical layer security
key generation
double-sided two-way ranging