Wireless Channel Key Generation for Multi-User Access Scenarios

Channel state information (CSI)-based channel key generation technology has been widely studied in recent years, but it lacks the application in multi-user access scenarios, and the commonly used CSI extraction tools are not easy to generalize to Internet of Things (IoT) scenarios. The emerging ESP CSI tool overcomes the limitations of traditional tools, but no one has used it for key generation related research. We transformed ESP CSI tool, proposed a numbered CSI extraction tool for key generation in multi-user access scenarios. Then, we conceived a corresponding key generation scheme based on this tool. Experimental results show that CSI data with high reciprocity can be obtained in different scenarios, and can generate keys with low key disagreement rate (KDR), high randomness, and anti-eavesdropping.