Covert communication system based on random noise modulation

Abstract

The invention discloses a covert communication system based on random noise modulation. At a transmitter, host data is taken as a seed of a Gaussian noise generator, a correlation coefficient of jointnormal distribution noise is modulated by a covert bit, and the joint normal distribution noise carrying the covert bit is linearly overlapped with output of a host transmitter digital modulator; andat a receiver, Gaussian noise the same as the transmitter is generated by taking the host data as the seed, then the Gaussian noise and the estimation of the joint normal distribution noise are correlated, and the covert bit can be restored through hard decision, so the covert transmission of the information is realized. The system has relatively high covert performance.

Description

technical field [0001] The invention relates to the technical fields of wireless communication and information security, in particular to a covert communication system based on random noise modulation. Background technique [0002] Due to the openness of electromagnetic space and the radiation of electromagnetic signal transmission, communication signals carrying important information are completely exposed in free space, and the wide adoption of standard protocols makes mobile data vulnerable to eavesdropping by illegal users during transmission. , It is very likely to lead to the leakage of important personal information such as user privacy and finance. Cryptography technology is to encrypt the plaintext information to be transmitted, turn the plaintext into unrecognizable ciphertext, and make the encrypted information difficult to understand. But doing so has brought another problem. The encryption technology encrypts the plaintext into a bunch of garbled characters, wh...

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