Research on Physical Layer Key Generation and Agreement Technology Based on Wireless Channels

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.