融合生成对抗网络的大气无线光信道密钥提取

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Secret key extraction from atmospheric wireless optical channels by combing with generative adversarial network

TIAN Zhuozhan 1 ， CHEN Chunyi 1，2* ，HU Xiaojuan1，YU Haiyang1，LI Yanfeng1，WANG Fang1 （1. School of Computer Science and Technology， Changchun University of Science and Technology， Changchun 130022，China; 2. Chongqing Research Institute， Changchun University of Science and Technology ， Chongqing 401135，China） * Corresponding author， E-mail： chenchunyi@hotmail. com

Abstract：Wireless optical channel key extraction serves as an effective method for achieving physical layer security，wherein legitimate parties generate a key sequence by detecting and estimating the features of the optical channel. Eavesdroppers， however，may capture key-related information through optical signals outside the legitimate party's receiving aperture. To address this challenge，a novel key extraction scheme was proposed. Initially，an enhanced generative adversarial network model was utilized to enable legitimate parties to accurately estimate channel features relevant for key extraction from the measured channel sequences. Subsequently，a random quantization alternating method was employed on the estimated channel feature sequences to derive the initial keys independently. Experimental results demonstrate that the key sequences generated by the legitimate parties exhibit high consistency，with the correlation coefficient between the channel feature sequences estimated by Alice and Bob reaching O.998 3 in a 25 dB SNR environment. Furthermore， thelinitial key disagreement rate produced by Alice and Bob is 1. 3×10-4 ，which is significantly reduced by the proposed scheme.The shared key obtained after information negotiation by the legitimate parties successfully passes the NIST randomness test，underscoring the eficacy and robustness of the proposed method in enhancing key extraction reliability.

Key Words：wireless optical channel；key extraction；generative adversarial network；convolutional neural network；gated recurrent unit；quantization

1引言

当前人们对无线信道信息传输速率和安全性的要求越来越高。（剩余15700字）