基于星座模糊的物理层加密技术研究

Research on Physical Layer Encryption Technology based on Constellation Obfuscation

利用对实际调制信号的星座映射设计,置乱已调符号的星座来保护调制方式和已调信息,从而保证信息传输的安全。提出一种基于信道系数的星座模糊设计(Constellation Obfuscation base on Channel coefficient,COC)方案,利用无线信道互易性和时变性特点,将信道系数作为初始密钥,在不需要部署第三方或密钥共享的情况下实现密钥生成。仿真结果表明,方案对信息具有很好的隐蔽作用,可以实现对被动窃听端攻击的保密。

By using the constellation mapping design of the actual modulated signal, the modulated signal constellation is scrambled to protect the modulated mode and the modulated information, so as to ensure the security of information transmission. In this paper, a constellation obfuscation design scheme based on channel coefficient(COC) is proposed. The channel coefficient is used as the initial key by taking advantage of the reciprocity and time-varying characteristics of wireless channel, and the key generation is realized without the deployment of third party or key sharing. Simulation results indicate that the scheme has a good concealment effect on information and can realize the confidentiality of passive eavesdropping attacks.