The Physical Layer Secrecy Coding Method of Hiding Confidential Information using Amplitude Difference of Fading Channel
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摘要: 针对基于码字结构的物理层安全编码方法安全间隙较大的问题，首先证明了低密度奇偶校验码中私密信息节点传输时的信道衰落幅度越小越有利于该节点的正确译码；然后选取合法信道衰落幅度最小的位置隐藏私密信息，形成有利于合法接收者译码的条件；再结合私密信息置乱将译码残余比特错误扩散到整个码字中，进一步提高窃听者对私密信息的译码错误概率。仿真结果表明，该方法的安全间隙比直接传输和仅私密信息置乱的方法分别缩小了23.5dB和4.5dB。Abstract: This paper focused on the problem that the code-based physical layer security coding has a large security gap. Firstly，this study proofed that the smaller the channel fading amplitude of the confidential information nodes is, the lower the bit error rate becomes in low-density parity-check codes. Then the confidential information nodes were hidden where the legitimate channel amplitudes are minimum, which turned the decoding condition better for legitimate receiver. Finally the scrambling was used to spread the error to the whole code words, which increased Eve’s error probability. The simulation results show that the security gap of this method is reduced by 23.5dB and 4.5dB compared with direct transfer and scrambling, respectively.
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