Random coefficient-moving product based wireless key generation

The physical layer key generation technique provides an efficient method, which utilizes the natural dynamics of wireless channel. However, there are some extremely challenging security scenarios such as static or quasi-static environment, which lead to the low randomness of generated keys. Meanwhile, the coefficients of the static channel may be dropped into the guard space and discarded by the quantization approach, which causes low key generation rate. To tackle these issues, we propose a random coefficient-moving product based wireless key generation scheme (RCMP-WKG), where new random resources with remarkable fluctuations can be obtained by applying random coefficient and by moving product on the legitimate nodes. Furthermore, appropriate quantization approaches are used to increase the key generation rate. Moreover, the security of our proposed scheme is evaluated by analyzing different attacks and the eavesdropper's mean square error (MSE). The simulation results reveal that the proposed scheme can achieve better performances in key capacity, key inconsistency rate (KIR) and key generation rate (KGR) compared with the prior works in static environment. Besides, the proposed scheme can deteriorate the MSE performance of the eavesdropper and improve the key generation performance of legitimate nodes by controlling the length of the moving product.