A key generation scheme for wireless physical layer based on frequency hopping

Abstract

Wireless physical layer key generation technology can effectively solve the problem of key distribution and management in traditional security mechanisms, and thus has been widely studied. In this paper, we propose a physical layer key generation scheme based on frequency hopping, which improves the key generation efficiency under the condition of static wireless channel with low physical layer key generation efficiency and low randomness. In addition, we apply the moving average and principal component analysis (PCA) of preprocessing methods to the channel characteristics, and perform double-threshold quantization to improve the consistency of the key generation. Finally, we verify the proposed key generation scheme on the hardware platform consisting of STM8L101 and CC1101. The experimental results show that when the frequency hopping step is 200KHz, the key agreement rate is higher than 99% and the key generation efficiency is 88%.