Method for building covert channel with network flow watermarking of forward error correction code and interleaved code

Abstract

The invention discloses a method for building a covert channel with network flow watermarking of a forward error correction code and an interleaved code, and relates to a covert channel for information secure transmission in the field of communication. The method comprises the following steps: firstly, encoding original secret information to be transmitted by an error correction code encoder, andprocessing an obtained codeword signal according to a network flow watermarking method; in a decoding stage, making a secret information receiver acquire a watermark signal from target network stream,and transmit the watermark signal to an interleaved code decoder for processing to obtain a de-transposed watermark signal; if the watermark signal is subjected to PN code spread spectrum processing,processing the watermark signal with a PN decoder; and finally, transmitting the de-transposed watermark signal or the PN decoded watermark signal to an error correction code decoder for processing to recover the original secret information. Through adoption of the method for building the covert channel with network flow watermarking of the forward error correction code and the interleaved code,the automatic error correction capability specific to the secret information is realized, and the reliability of information transmission is enhanced.

Description

technical field [0001] The present invention relates to a covert channel for secure information transmission in the field of communication, in particular to a method for establishing a covert channel using network stream watermarks of forward error correction codes and interleaving codes, which can ensure the reliability and concealment of information transmission, and can resist external interference and damage. . Background technique [0002] With the popularization of the Internet and the advent of the era of big data, information transmission is becoming more and more important, and network data traffic is also growing rapidly. According to the complete forecast of Cisco Visual Networking Index (Visual Networking Index 2016-2021) [1] , global IP traffic will grow from 1.2ZB in 2016 to 3.3ZB in 2021, including a large number of network attacks, such as the global DDoS in 2016 [2] The number of attacks increased by 172%. There are still many unauthorized users on the ne...

AI Technical Summary

Problems solved by technology

[0006] However, people often regard network watermarking as a method of tracking attack sources and intrusion detection, rather than a method of transmitting secret information. The main reason is two limitations of network watermarking: (1) The watermark signal is easily distorted

(2) Watermark detection emphasizes error detection but cannot correct errors

However, the existing time channel method does not have the function of automatic error correction, and it is necessary to add an error detection and retransmission mechanism to ensure the correctness of information transmission

Images