부산대학교 도서관

The idea of physical layer security is to use the characteristics and damage of the propagation medium to ensure secure communication in the physical layer. Channel state information is a fine-grained value from the physical layer, which describes the amplitude and phase of each sub-carrier in the frequency domain. It estimates the channel information by representing the channel properties of the communication link. Due to the uniqueness and short-term reciprocity of the channel, both the sender and receiver can obtain almost the same and random CSI in a short time, and can generate the same and random key to realize secure communication between the two parties. At present, most of the traditional methods of obtaining CSI are costly, bulky, and limited in regions. In order to verify the validity, feasibility and stability of extracting CSI with Nexmon firmware and using it to generate keys, this paper verifies its performance.