Physical layer anti-interception secure communication method and system

Abstract

The invention relates to a physical layer anti-interception secure communication method and system. The method is characterized in that modulation and coding for anti-interception security are carriedout on an original information bit stream in a physical layer, and then a plurality of symbol code elements are generated and sent, on one hand, a plurality of symbol code elements have a rateless characteristic in the aspect of encoding, so transmission efficiency of the original information bit stream can be improved, transmission can be carried out close to the capacity of a preset channel between a legal transmitting end and a legal receiving end, and decoding difficulty of an illegal receiving end, namely an illegal eavesdropper, is increased while transmission efficiency is ensured, onthe other hand, as a plurality of symbol code elements are in Gaussian distribution, ultra-Gaussian distribution or sub-Gaussian distribution, an illegal eavesdropper cannot extract specific distribution of a plurality of symbol code elements by using a blind detection method based on a high-order cumulant and the like, so interception resistance and security of a physical layer of a communicationsystem are further improved.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a physical layer anti-interception secure communication method and system. Background technique [0002] The security of the communication system has always been the focus of attention, and the wireless communication system has declined due to the broadcast and openness of the channel. The traditional encryption method generally occurs in the upper layer of the network protocol, and is mostly realized through authentication and encryption technology, but the algorithm-based encryption method reliability code, artificial noise precoding, convex optimization precoding, spread spectrum and error control coding, etc. Technology, the application in practice is not yet mature, and the physical layer security that has emerged in recent years occurs at the bottom layer of the network protocol, which can be independent of the traditional encryption method. From the perspective of in...

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Problems solved by technology

The traditional encryption method generally occurs in the upper layer of the network protocol, and is mostly realized through authentication and encryption technology, but the algorithm-based encryption method reliability code, artificial noise precoding, convex optimization precoding, spread spectrum and error control coding, etc. Technology, the application in practice is not yet mature, and the physical layer security that has emerged in recent years occurs at the bottom layer of the network protocol, which can be independent of the traditional encryption method. From the perspective of information theory, it provides a new idea of ​​​​anti-eavesdropping , the specific technologies include beamforming and zero-forcing precoding, but they are more vulnerable to eavesdroppers, and their security problems are more prominent

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