无线信道幅度特性等概率量化生成密钥方案

Secret Key Generation Scheme by Equal Probability Quantization for Wireless Channel Amplitude Characteristics

针对基于无线信道幅度特征的物理层密钥生成方案适应性差的问题,在现有方案的基础上,提出了无线信道幅度特性等概率量化生成密钥方法.该方法基于无线窃听信道系统模型,通过合法双方互发信道探测信号,分析无线信道特征,提取信道幅度特性.并基于该特性采用等概率量化方法生成密钥随机参数,以提高动态通信环境下量化门限适应性.实验结果表明,与等间隔量化相比,该方案可保证生成密钥随机参数的随机性,能够有效提高信道特性量化的一致性和安全性.

Aiming at the poor adaptability of the physical layer secret key generation schemes based on the amplitude characteristics of the wireless channel,a method for generating the secret key by the equal probability quantizing of wireless channel amplitude characteristics is proposed.This method,based on the wireless eavesdropping channel system model,analyzes the characteristics of the wireless channel and extracts the channel amplitude characteristics through the mutual transmission of channel detection signals between the legal parties.Based on this characteristic,an equal probability quantization method is used to generate secret key random parameters to improve the adaptability of the quantization threshold in a dynamic communication environment.Experimental results show that,compared with the equal interval quantizing,this scheme guarantees the randomness of the generated secret key random parameters and effectively improves the consistency and security of channel characteristic quantization.