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Covert communication method for concealing weighted signal by using common signal sequence

A covert communication and signal sequence technology, applied in the field of communication, can solve the problem of secret information non-destination host discovery, achieve the effect of enhancing non-correlation, reducing the probability of discovery and deciphering

Inactive Publication Date: 2012-08-15
HARBIN INST OF TECH
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  • Claims
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Problems solved by technology

[0025] The purpose of the present invention is to solve the problem that when the existing four-item weighted fractional Fourier transform is used for covert communication, there is additional noise when loading secret information in the signal waveform domain to cover the purpose of covert communication, and the secret information is easy to be detected by non-target hosts. The problem found, providing a covert communication method using general signal sequences to hide weighted signals

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  • Covert communication method for concealing weighted signal by using common signal sequence
  • Covert communication method for concealing weighted signal by using common signal sequence
  • Covert communication method for concealing weighted signal by using common signal sequence

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specific Embodiment approach 1

[0037] Specific implementation mode one: combine figure 1 This embodiment will be described, a covert communication method using a general signal sequence to hide a weighted signal described in this embodiment.

[0038] Its specific steps are:

[0039] Transmitter side:

[0040] Step 1: take the general signal sequence as the bunker signal after baseband modulation;

[0041] Step 2: Obtain a hidden signal after baseband modulation of the hidden secret information;

[0042] Step 3: Encrypt the hidden signal obtained in step 2 using four-item weighted fractional Fourier transform to obtain a weighted signal, and add the weighted signal to the bunker signal obtained in step 1 after amplitude attenuation to obtain an encrypted hidden signal;

[0043] Step 4: The encrypted hidden signal obtained in Step 3 is modulated by a digital carrier, and then sent to the channel for transmission after D / A conversion and up-conversion;

[0044] Receiver side:

[0045] Step 5: When the rec...

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Abstract

The invention discloses a covert communication method for concealing weighted signal by using common signal sequence, relating to the technical field of communication and solving the problems in the prior art that additional noise conceals covert communication during secret information loading in signal wave form domain when adopting four-item weighted score Fourier transform to perform covert communication, and that secret information is easy to discover by an unobjective host. The communication method in the invention comprises: taking a signal of a common sequence after modulation by a base band as a cover signal, modulating covert secrete information by the base band, encrypting by adopting four-item weighted score Fourier transform, implanting the encrypted cover signal into the cover signal to finish information covert communication, when the receiver and the transmitter are synchronous, demodulating the received signal and then subtracting the cover signal to obtain a covert information sequence, and performing four-item weighted score Fourier inversion to obtain corresponding covert information. The invention is extensively applicable in the technical field of covert communication.

Description

technical field [0001] The invention relates to a realization method of embedding a weighted signal in a general signal sequence to achieve covert communication, and belongs to the technical field of communication. Background technique [0002] Information hiding technology emerged from abroad in the mid-1990s. It is a new technology integrating multidisciplinary theories and technologies, and it has quickly aroused the research interest of professionals. It uses the insensitivity of human sensory organs and the redundancy of multimedia digital signals to hide secret information in the host signal, so that it will not be detected or noticed by the human sensory system, and it will not affect the sensory effect of the host signal. and practical value. The most important feature of information hiding is that it not only hides the content of information, but also hides the existence of information, so it shows more excellent characteristics in the field of information security...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/00H04K1/00H04L1/00H04L25/02
Inventor 沙学军梅林张钦宇张乃通张中兆顾学迈詹宗超冯红
Owner HARBIN INST OF TECH
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