融合生成对抗网络的大气无线光信道密钥提取  

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

作　　者：田卓展 陈纯毅[1,2] 胡小娟 于海洋[1] 李延风[1] 王芳[1] TIAN Zhuozhan;CHEN Chunyi;HU Xiaojuan;YU Haiyang;LI Yanfeng;WANG Fang(School of Computer Science and Technology,Changchun University of Science and Technology,Changchun 130022,China;Chongqing Research Institute,Changchun University of Science and Technology,Chongqing 401135,China)

机构地区：[1]长春理工大学计算机科学技术学院,吉林长春130022 [2]长春理工大学重庆研究院,重庆401135

出　　处：《光学精密工程》2025年第3期486-496,共11页Optics and Precision Engineering

基　　金：国家自然科学基金资助项目(No.62275033);吉林省科技发展计划资助项目(No.YDZJ202501ZYTS300);重庆市自然科学基金资助项目(No.cstc2021jcyj-msxmX0457)。

摘　　要：无线光信道密钥提取是实现物理层安全的一种有效手段,合法双方通过探测并估计信道特征从而生成密钥序列。窃听方可能通过合法方接收孔径外的光信号获得密钥相关信息。为此提出一种密钥提取方案,该方案通过改进生成对抗网络模型,合法双方用该模型从信道测量序列中估计可用于密钥提取的特征。然后,合法双方对各自的信道特征估计序列进行随机交替量化,得到初始密钥。实验结果表明,合法双方经本方案生成密钥序列具有较高的一致性。在25 dB信噪比环境下Alice和Bob估计的信道特征序列的相关系数为0.9983,经量化生成初始密钥的不一致率为1.3×10^(-4)。本方案能够进一步降低合法双方生成初始密钥的不一致率,合法双方经信息协商后提取的共享密钥能通过NIST随机性测试。Wireless optical channel key extraction serves as an effective method for achieving physical lay⁃er 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 legiti⁃mate 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 0.9983 in a 25 dB SNR envi⁃ronment.Furthermore,the initial 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 efficacy and robust⁃ness of the proposed method in enhancing key extraction reliability.

关 键 词：无线光信道 密钥提取 生成对抗网络 卷积神经网络 门控循环单元 量化 

分 类 号：TN921[电子电信—通信与信息系统] TP391.9[电子电信—信息与通信工程]