Steganalysis method and device based on least significant bit matching

A least significant bit and steganalysis technology, applied in the field of information hiding analysis, can solve problems affecting the accurate detection of steganographic information, and achieve the effect of improving the positive detection rate

CN108805786BActive Publication Date: 2022-05-10PEKING UNIV +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2022-05-10

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Abstract

The invention relates to a steganalysis method and device based on least significant bit matching, which divides an image sequence into several disjoint blocks, and each block satisfies a multivariate Gaussian distribution to obtain the first expression of the image sequence; according to the least significant bit The matching algorithm is used to determine the second expression of the image sequence after embedding the hidden information; according to the first expression and the second expression, the likelihood ratio expression is determined; according to the Taylor expansion algorithm, the likelihood ratio expression is processed to determine The detection subexpression of each block; divide the observation image into disjoint blocks, and determine the detection subvalue of each block in the observation image according to the detection subexpression; analyze the smoothness of the observation image to determine the observation image The smoothness value of each block in ; according to the preset smoothness threshold, sum the detector values ​​of the blocks satisfying the preset smoothness threshold to obtain the judgment detector of the observed image; according to the judgment detector of the observed image, determine Observe whether the image is a steganographic image.
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Description

technical field

[0001] The invention relates to the field of information hiding analysis, in particular to a steganalysis method and device based on least significant bit matching. Background technique

[0002] Information Hiding is a research hotspot in the field of information security, and has been widely used in military, political, commercial and other fields. Information hiding includes digital watermarking (Digital Watermarking) and image steganography (Steganography) two branches. These two branches have many similarities in technical realization, but each has its own characteristics, and its purpose is very different. The purpose of digital watermarking technology is to protect the copyright of multimedia data, so that more emphasis is placed on the robustness of secret information; while the purpose of image steganography is to deliver information secretly and safely, because it is necessary to avoid causing the second party as much as possible. Suspicion by the ...

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Embodiment Construction

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0043] figure 1It is a schematic flow chart of a steganalysis method based on least significant bit matching shown in an exemplary embodiment of the present invention. This method is obtained by improving and correcting the algorithm of the existing image steganography technology. First, the existing technology based on A steganalysis algori...