Research on Physical Layer Key Generation and Agreement Technology Based on Wireless Channels
Jin H. Qian, Jun Luo, Hongyan Lv, Chao Chen, Yu Jiang · 2024
With the rapid development of wireless networks, the application of wireless devices in the field of communication is be-coming increasingly widespread. However, the openness of wire-less channels makes them susceptible to various factors such as channel interference, leading to increased network security risks. This paper investigates a physical layer key generation scheme based on wireless channels and designs a complete system for key generation in one-to-many scenarios. The system includes four stages of the key generation scheme: channel measurement, quan-tization, key agreement, and privacy amplification. In the channel measurement stage, a sequence-based method is used to ensure signal reciprocity. Additionally, in the privacy amplification stage, a rule for key selection and combination is designed to make the key practically applicable. Finally, the performance and security of the system are experimentally tested and analyzed.