Key generation method, device and system based on communication system, equipment and medium

The invention provides a key generation method, device and system based on a communication system, equipment and a medium, and relates to the technical field of communication. The method comprises the following steps: during current channel detection, performing antenna switching on a first antenna for previous channel detection in a plurality of antennas to obtain a first antenna for current channel detection; receiving a first detection signal sent by the second equipment through the first antenna of the channel detection; extracting a channel characteristic parameter of the first detection signal; if the preset detection end condition is not met, entering the next channel detection until the preset detection end condition is met, and ending the channel detection to obtain the channel characteristic parameters of the plurality of first detection signals; and generating a first physical layer key based on the channel characteristic parameters of the plurality of first detection signals. According to the embo