基于矢量量化的高效随机物理层密钥提取方案

摘要

To solve the dilemma that a high bit generation rate and a low probability of bit disagreement can′t be a-chieved simultaneously in current physical layer key extraction schemes,a high-speed random key extraction scheme based on vector quantization (HRVQ)which just employs the RSS of Wi-Fi signal is proposed.First,the inconsistent RSS meas-urements between the two communication parties were reduced by inconsistency removal to achieve low bit disagreement rate.Then,the vector quantization was introduced to accelerate the extraction of bit streams from channel information and a-chieve high bit generation rate.Last,fuzzy extractor was employed to achieve adequate randomness and zero bit disagreement rate.The result of experiments indicates that our scheme outperforming the best scheme of the state-of-the-art can reach a 284% bit generation rate with a zero bit disagreement rate and a guaranteed randomness.%针对现有的物理层密钥生成方法中存在的生成速率偏低、误码率高等问题，借助无线信号接收信号强度RSS，提出了基于矢量量化的高效随机物理层密钥提取方案（HRVQ）。该方案通过不一致性去除减少通信双方不一致的信道特征值，利用矢量量化将信道信息转化为0、1比特流，并通过模糊提取器进行纠错和随机性增强处理。实验表明：该方案在密钥生成速率方面达到了284％的比特生成率，并且在实现了零误码率的同时保证了生成密钥的随机性。