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Covert communication system based on random noise modulation

Active Publication Date: 2018-10-09
ZHEJIANG POLICE COLLEGE
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Problems solved by technology

[0005] In order to overcome the shortcomings of the existing legitimate users that they cannot reliably ensure that important information is not eavesdropped and have poor concealment, and in order to enable legitimate users to realize the safe transmission of concealed data, the present invention proposes a random noise modulated covert communication system. It is a covert communication system that relies on the communication link of one's own party (or other party, or even the enemy's). Because its channel avoids the enemy's intentional interference and physical destruction, it is a highly survivable communication system. covert means of communication

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  • Covert communication system based on random noise modulation

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Embodiment Construction

[0039] The present invention will be further described below in conjunction with the accompanying drawings.

[0040] refer to Figure 1 ~ Figure 3 , a covert communication system based on random noise modulation, comprising:

[0041] A covert transmitter for generating a Gaussian white noise generator in a covert system using host communication data as a seed to generate a noise sequence n 1 , n 2 ; n 1 , n 2 Constitute the joint normal distribution noise w, whose correlation coefficient is hidden bit c to modulate; the random noise w is superimposed on the digitally modulated output of the traditional digital transmitter, enters the up-sampling and root-raised cosine filter, and then transmits to the channel;

[0042]The covert receiver is used for the synchronization, channel estimation and recovery of random noise w at the receiving end of the covert system, all of which are completed with the help of the host system; the data of the host system is used as the seed of t...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L29/06H04L1/20H04L25/02
CPCH04L1/203H04L25/0202H04L63/0428
Inventor 王亢周国民李国军董齐芬
Owner ZHEJIANG POLICE COLLEGE
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