Analysis and application of endogenous wireless security principle for key generation

The open and broadcast nature of wireless channels leads to the inherent security problem of information leakage in wireless communication. We can utilize endogenous security functions to resolve this problem. The fundamental solution is channel-based mechanisms, like physical layer secret keys. Unfortunately, current investigations have not fully exploited the randomness of wireless channels, making secret key rates not high. Consequently, user data can be encrypted by reducing the data rate to match the secret key rate. Based on the analysis of the endogenous wireless security principle, we proposed that the channel-based endogenous secret key rate can nearly match the maximum data rate in the fast-fading environments. After that, we validated the proposition in an instantiation system with multiple phase shift keying (MPSK) inputs from the perspectives of both theoretical analysis and simulation experiments. The results indicate that it is possible to accomplish the onetime pad without decreasing the data rate via channel-based endogenous keys. Besides, we can realize high-speed endogenously secure transmission by introducing independent channels in the domains of frequency, space, or time. The conclusions derived provide a new idea for wireless security and promote the application of the endogenous security theory.