基于差异阈值循环分组的密钥生成算法  

Key generation algorithm based on cyclic grouping of difference thresholds

作　　者：李贵勇[1] 何斌 方磊[1] LI Guiyong;HE Bin;FANG Lei(College of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065

出　　处：《计算机应用》2024年第7期2110-2115,共6页journal of Computer Applications

基　　金：重庆市自然科学基金资助项目(cstc2021jcyj-msxmX0454)。

摘　　要：针对无线通信中通信双方提取的信道特征存在明显差异,导致双方的密钥生成速率和一致率较低的问题,提出差异阈值循环分组的密钥生成算法(TGKG)。首先,对信道状态信息(CSI)进行差异阈值分组,使任意组内元素间的间隔均大于该值,提高组内数据的差异,减小量化误差以降低密钥不一致率;循环分组只需一方进行,防止因数据误差导致的分组不一致。同时,提取信道系数的实部和虚部量化,增加量化比特数目,提高了密钥生成速率。通过概率论及信息论公式证明了所提算法在密钥不一致率、密钥可达速率和安全性3方面的优势。实验结果表明,所提算法在5 dB信噪比(SNR)条件下,通信双方的密钥不一致率约为2%,密钥生成速率约为142%。For that channel features extracted by the two communication parties are significantly different,resulting in a low key generation rate and consistency in wireless communications,a Key Generation algorithm based on cyclic Grouping of difference Thresholds(TGKG)was proposed.First,the Channel State Information(CSI)was grouped with a threshold,by which the interval of data within the group was greater than the threshold,so that quantization error and hence key disagreement rate was reduced.To avoid inconsistent grouping due to data errors,circular grouping was performed on one side only.Meanwhile,the algorithm was applied to quantize real part and imaginary part of CSI,respectively,significantly increasing key generation rate.The advantages of the proposed algorithm was proved in terms of key disagreement rate,key generation rate and security by probabilistic and information theoretic formulas.The experimental results show that the key disagreement rate of the proposed algorithm for both communicating parties is about 2%,and the key generation rate is about 142%under the Signal-to-Noise Ratio(SNR)condition of 5 dB.

关 键 词：物理层安全 密钥生成 差异阈值循环分组 密钥不一致率 密钥生成速率 

分 类 号：TN918.4[电子电信—通信与信息系统]