一种OFDM系统信道密钥生成方法

摘要

This paper proposes a method for channel key generation in Orthogonal Frequency Division Mul-tiplexing(OFDM) systems through exploiting channel frequency response(CFR),quantization,reconcilia-tion,confirmation and privacy amplification. Firstly,by utilizing the advantage of multi-carrier,channel characteristics are extracted in subchannels and quantization.Then,sliding window key generation mecha-nism and segment checking are used for initial channel key generation.The reconciliation process is accom-plished efficiently with one single location interaction.Finally,privacy amplification function is used to gen-erate channel secret key.With the proposed method,a large number of key bits are generated through the sliding window,multi-round reconciliation is replaced with a single round reconciliation,and limitting the maximum length of initial key makes initial key kept random both in length and information.%提出了一种在正交频分复用(OFDM)系统中提取信道频率响应(CFR)表征信道特征,经过探测、量化、协商、一致性确认以及隐私放大生成信道密钥的方法.首先,利用OFDM系统多载波的优势,在各个子信道提取信道特征,并进行量化;然后,采用滑窗密钥生成机制以及分段校验,通过一次位置信息交互,高效地完成协商,生成初始信道密钥;最后,利用隐私放大函数生成信道密钥.所提方法通过滑窗生成大量密钥比特,以一轮协商代替多轮协商;只限定初始密钥最大长度,使得初始密钥在长度及信息两个维度保持随机化.