A method of constructing the first type of eavesdropping channel through bsbc

Abstract

The invention discloses a method for constructing a first-class wiretap channel through a BSBC (Binary Symmetric Broadcast Channel). The method comprises the following steps that: a legitimate receiver transmits feedback information to a legitimate transmitter through the BSBC; the legitimate transmitter and a wire tapper receive the feedback information interfered by noise of the legitimate receiver respectively, and the legitimate transmitter processes encoded information to be transmitted according to the received feedback information and then transmits the processed information through an error-free common channel; the legitimate receiver extracts bit log-likelihood ratio information needed by soft-decision decoding in a specific way firstly, and then decodes the received information in a soft-decision decoding way in order to lower the bit error rate of a main channel, enhance the channel reliability, enlarge a quality difference between the main channel and the wiretap channel and increase the security capacity of the first-class wiretap channel; and the wire tapper passively wiretaps the information transmitted by the legitimate transmitter, and decodes the received information in the soft-decision decoding way. The method is easy to implement, and high channel security capacity and good communication quality are achieved.

Description

technical field [0001] The invention belongs to the technical field of communication security, in particular to a method for constructing a first-type eavesdropping channel through BSBC. 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 open system interconnection 7-layer protocol, the information security mechanism of traditional communication systems is based on the network layer and above. The core technology is the key encryption mechanism. The transmission link of the physical layer has not been paid enough attention to. However, due to the openness and versatility of the electromagnetic signal transmission environment, within the effective coverage of the transmission power, any third ...

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Problems solved by technology

But this scheme still has some deficiencies: (1) The legitimate 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 correction codes and other technical means to make the public channel completely Reliable, which additionally increases the complexity of 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. The upper bound on the maximum safe transfer rate resulting in subsequent safe and reliable encoding is not high

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