基于度1的二次LT编码信息安全传输设计

Design of secondary LT code information security Transmission based on the symbols of degree 1

由于窃听信道中的LT编码可以有效降低窃听者的截取信息效率,设计出一种基于LT码中的度1符号再次进行LT编码的防窃听信道编码方法,先将LT码的部分编码矩阵依据度大小重新排列,对排列后得到的连续度1符号进行第二次LT编码,利用BP译码恢复LT码需要度1符号,从达到延迟窃听者开始译码时间、降低窃听者截获效率的目的。实验结果表明,与传统防窃听LT码相比,该方法提出的LT防窃听码在几乎不增加合法接收者译码符号数量情况下,可以使窃听者的截获效率降幅更为明显。

Since LT codes can effectively reduce the efficiency of interception of the eavesdroppe in the eavesdropping channel r,this paper design a kind of re-encoding method which based on the symbols of degree 1 of LT codes in anti-eavesdropping channel. In the first place, the part code matrix of LT codes need to be rearranged according to the size of degree, and then proceeding the second consecutive LT coding to the symbols of degree 1 which have been arranged. Because BP decoding recovery LT codes, it need the symbols of degree 1. So it can reach the goal of delaying the eavesdropper’s starting decoding time and reducing the interception efficiency of the eavesdropper.The experimental results show that, compared with the traditional anti-eavesdropping LT codes, this paper proposed the method can reduce the interception efficiency of eavesdroppers more significantly without increasing the number of symbols decoded by the legal receiver.