基于相位估计的无线窄带通信系统的合作密钥生成策略

Cooperative secret key generation based on phase estimation for narrowband fading channels

利用无线信道的随机特性,可以通过特定的密钥生成协议在物理层生成两个终端之间的密钥.然而由于信道的相关时间较短和用户移动而产生的多普勒效应的影响,传统的密钥生成速率往往非常有限.针对无线窄带通信系统的特点,提出了一种通过物理层合作的密钥生成策略,不仅大大提高了密钥产生速率,而且增强了无线通信系统的安全性.

By exploiting the randomness of wireless channel, secret keys between two terminals can be generated through certain key generation agreement in the physical layer （PHY）. However, due to the shorter correlation time of the channel and the Doppler Effect caused by the users ’ mobility, traditional key generation rate is limited. In this paper, we propose a new physical layer cooperative key generation protocol. Theoretical analysis is also given through both information theory and signal statistical analysis. The simulation results show that compared with non-cooperative key generation protocol, the new protocol greatly improves the key generation rate due to the relay node.