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Physical layer key generation technology which leverages channel randomnessto generate secret keys has attracted extensive attentions in long range(LoRa)-based networks recently. We in this paper develop a software-definedradio (SDR) based LoRa communications platform using GNU Radio on universalsoftware radio peripheral (USRP) to implement and evaluate typical physicallayer key generation schemes. Thanks to the flexibility and configurability ofGNU Radio to extract LoRa packets, we are able to obtain the fine-grainedchannel frequency response (CFR) through LoRa preamble based channel estimationfor key generation. Besides, we propose a lowcomplexity preprocessing method toenhance the randomness of quantization while reducing the secret keydisagreement ratio. The results indicate that we can achieve 367 key bits witha high level of randomness through just a single effective channel probing inan indoor environment at a distance of 2 meters under the circumstance of aspreading factor (SF) of 7, a preamble length of 8, a signal bandwidth of 250kHz, and a sampling rate of 1 MHz.

Implementation and Evaluation of Physical Layer Key Generation on SDR based LoRa Platform