Method for establishing first side channel under BI-AWGN broadcast channel

Abstract

A method for establishing a first side channel under a BI-AWGN broadcast channel includes the steps that a legal receiver sends feedback information through a binary input additive white Gaussian noise broadcast channel, and a legal sender and an eavesdropper receive the feedback information influenced by noises respectively; the legal sender encodes to-be-sent information according to the received feedback information and sends the to-be-sent information through an error-free public channel, wherein the complexity degree of system obtaining is reduced; after the legal receiver receives the information of the legal sender, bit logarithm likelihood ratio information is extracted and is then decoded in a soft decision decoding mode, and a soft decision decoding algorithm with high reliability is selected for use, wherein the reliability of a main channel is improved, the quality difference of the main channel and the side channel is expanded, and the security capacity of the first side channel is further improved; the eavesdropper passively eavesdrops the information of the legal sender and conducts decoding in a soft decision decoding mode. The method is low in difficulty, high in channel security capacity and high in transmission rate.

Description

technical field [0001] The invention relates to the technical field of communication security, in particular to a method for constructing a first-type wiretapping channel under a BI-AWGN broadcast channel. Background technique [0002] With the rapid development of information technology, the dependence of private information and commercial information transmission on wireless communication network is obviously increasing, and the attention of the security issues of the communication system itself is also increasing rapidly. Based on the 7-layer protocol of Open System Interconnection, the information security mechanism of the traditional communication system is established on the network layer and the layers above. Its core technology is the key encryption mechanism. The transmission link of the physical layer information security has not attracted enough attention. However, due to the openness and versatility of the electromagnetic signal transmission environment, within ...

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Problems solved by technology

However, there are still some deficiencies in this scheme: (1) The legal sender needs to use the noisy public channel to send information, so it is necessary to reduce the information transmission rate and combine strong error-correcting codes and other technical means to make the public channel completely Reliable, which additionally increases the complexity of the system implementation; (2) The weak error correction ability of the hard-decision decoding algorithm leads to low reliability of the main channel, so that the effect of expanding the quality advantage of the established channel is not obvious, and it will also The upper bound on the maximum safe transfer rate resulting in subsequent safe and reliable encoding is not high

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