基于等效信道的物理层认证和密钥分发机制
摘要
The authentication of transmitting terminal in present physical-layer security method based on wireless channel character is implemented by checking the pilot signal sent by it, and missing detection often happens. A new kind of physical-layer authentication and key distribution mechanism based on equivalent channel is presented. The equivalent channel is built by encrypting keys with channel character of multi time slots, as a result difference of different channels is mapped onto transmitting distortion. And mutual information of delivering and receiving terminals channel characters can be told by correctness of the transmission, thus the key distribution and authentication are implemented at the same time. Analysis and simulation reveal that key distribution performance in this method is same as the existing one, and the attack can be recognized in circumstances of channels with strong correlation.