Enhancement of Physical Layer Security in LoRa Networks Using Optimal Key Generation

Physical Layer Security (PLS) uses channel parameters to generate secret keys to secure communications between legitimate users. However, implementing PLS on Long Range (LoRa) networks faces challenges such as low reciprocity, a trade-off between key disagreement and generation rates, and limited key randomness due to the many LoRa network implementations on fixed networks. This research introduced a new method for choosing optimal window lengths in Savitzky-Golay filters combined with modified SKYGlow quantizations, outperforming previous works that did not use optimal window lengths and used 4-ary quantization. Experimental results show a significant increase, with the key generation rate reaching 6.9537 bps and decreasing the key disagreement rate to 0.07827. Thus, generating a key of 128 bits takes only 18.4 s. This research significantly contributes to developing more reliable and secure SKG techniques on LoRa networks.