基于光OFDM双极实数采样的密钥生成协议

Key generation protocol based on optical OFDM bipolar real number sampling

针对光信道特性生成密钥十分困难的问题,提出一种室内环境中光正交频分复用(orthogonal frequency division multiplexing,OFDM)的密钥生成协议,以提升室内可见光通信(visible light communication,VLC)网络的保密性.该方法从光OFDM所产生的双极OFDM样本中生成密钥,分配一部分循环前缀样本并将其放置在信道影响较小的区域中,以在整个会话期间进行密钥提取.为了提供较高的物理层安全性,每个OFDM信号帧均由不同的密钥加密.蒙特卡洛仿真实验表明,所提方法在密钥生成过程中,平均电信噪比更高,端到端性能更优,适合于低复杂度、低失配率密钥提取的情形.

Aiming at the problem that the key generation by optical channel characteristics is very difficult,a key generation protocol based on optical orthogonal frequency division multiplexing(OFDM)in an indoor environment is presented,so as to improve the security of indoor visible light communication(VLC)network.This method generates keys from the bipolar OFDM samples generated by optical OFDM,assigns a portion of the cyclic prefix samples and places them in the regions with small channel influence,so as to extract the keys during the whole session.In order to provide higher physical layer security,each OFDM signal frame is encrypted by different keys.Monte Carlo simulation results show that the proposed method has higher average electrical signal-to-noise ratio and better end-to-end performance in the generation of secret keys,and it is suitable for the case of low complexity and low mismatch rate key extraction.