Bayesian inference-based code element rewriting information hiding detection method and system

A detection method and information hiding technology, applied in the fields of information security and machine learning, can solve problems such as difficulty in obtaining compressed voice information hiding methods.

Active Publication Date: 2018-04-13
INST OF ACOUSTICS CHINESE ACAD OF SCI +1
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AI Technical Summary

Problems solved by technology

In the actual application process, it is difficult to obtain the information hiding method used in compressed speech. Therefore, it is necessary to study a general code element rewriting information hiding detection method

Method used

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  • Bayesian inference-based code element rewriting information hiding detection method and system
  • Bayesian inference-based code element rewriting information hiding detection method and system
  • Bayesian inference-based code element rewriting information hiding detection method and system

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Embodiment Construction

[0068] The present invention will be further described in conjunction with the accompanying drawings and specific embodiments.

[0069] Such as figure 1 Shown, a kind of code element rewriting information hiding detection method based on Bayesian reasoning, described method comprises the following steps:

[0070] Step S1) Calculate the value distribution entropy of the compressed speech symbol according to the training sample, and select the symbol whose distribution entropy is less than the threshold value as the steganographic sensitive symbol; specifically include:

[0071] Step S1-1) calculates the value distribution of the compressed speech code element, and the value range of the k-th code element is [0, r k ], its value probability distribution is

[0072] Step S1-2) calculate each symbol value distribution entropy according to the symbol value probability distribution, the distribution entropy E of the kth symbol value k Calculated as follows:

[0073]

[0074...

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Abstract

The invention discloses a code element rewriting information hiding detection method based on Bayesian inference. The method comprises the steps that 1) steganographic sensitive code elements are selected according to the entropy of compressed speech code element value distribution in a training sample, and a strong code element association network is constructed; a code element Bayesian network classifier is constructed based on the strong code element association network, and Dirichlet distribution is used as parameters for priori distribution learning of the code element Bayesian network classifier; 2) according to the code element Bayesian network classifier and the training sample, a steganographic index threshold Jthr is calculated; and 3) for an unknown type of compressed speech, the steganographic index J0 is calculated; if J0 is greater than or equal to Jthr, the speech segment is an unimplerfied speech segment; if J0 is less than Jthr, the speech segment is a steganographic speech segment. According to the invention, the method can acquire a more accurate steganographic detection result; the method uses the code elements in a codestream as the analysis object; decoding isnot needed; and real-time steganographic detection is realized.

Description

technical field [0001] The invention relates to the technical fields of information security and machine learning, in particular to a code element rewriting information hiding detection method and system based on Bayesian reasoning. Background technique [0002] With the continuous increase of bandwidth and the enhancement of network convergence trend, the network streaming media service based on network data communication has achieved unprecedented development, and network compressed voice stream has become one of the commonly used carriers for covert communication. While it brings convenience to people's life and work, it also brings opportunities for criminals. For sensitive institutions, it is necessary to evaluate and review the voice code stream in the institution to determine whether there is a covert communication channel for leakage of secret information. Information hiding detection technology, as a countermeasure against covert communication, can effectively moni...

Claims

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Application Information

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IPC IPC(8): G10L19/018G10L15/14G10L15/06G06K9/62
CPCG10L15/063G10L15/14G10L19/018G06F18/24155
Inventor 李松斌杨洁邓浩江
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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