STC Coding Method Based on Two-layer Optimal Allocation Ratio of Embedded Quantity
An optimal allocation and encoding method technology, applied in the field of information security, can solve the problems that traditional steganography cannot resist well, and the accuracy rate can distinguish common carriers, etc., to achieve the effect of reducing the number of embedding modification points and ensuring security
Inactive Publication Date: 2019-08-27
INST OF INFORMATION ENG CHINESE ACAD OF SCI
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[0007] 4) Security: Even if you have prior knowledge of the steganographic algorithm, the existing steganalysis methods cannot distinguish between ordinary carriers and files steganographiced by the algorithm with a high enough accuracy rate
[0015] Traditional steganography has been abandoned by researchers due to its inability to resist attacks based on high-dimensional feature steganalysis
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[0097] Attached below Figure 4-10 The present invention is further described.
[0098] Before adopting the present invention to steganographically embed secret information, the data to be embedded can be encrypted first to obtain a random binary data stream. The self-adaptive steganography proposed by the present invention adopts the trellis code coding method based on the two-layer optimal allocation ratio of the embedding amount, in the secret information embedding process such as Figure 4 As shown, the specific operation details are as follows:
[0099] 1) Image preprocessing: under the current channel of the image, the current channel of the image is expressed as a vector x, the carrier vector x is expressed in the form of 8-bit binary, and the lowest bit plane and the next lowest bit plane are respectively taken out and expressed as a vector x 1 and the vector x 2 ( Figure 10 ). The vector x is a numerical vector from 0 to 255, and the vector x 1 and the vector ...
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The invention relates to an STC coding method based on an embedding amount dual-layer optical distribution ratio. The method comprises the steps that embedding information is embedded into a lowest bit and a secondary low bit of a carrier image according to source coding in an optimal mode, and secret information is extracted from two hidden channels in the extraction process. In an image correction process, + / -1 improvement is carried out on pixels, and + / -2 improvement on parts of pixels is allowed, the embedding correction point number is substantially reduced, and the safety after steganography embedding is ensured. By adopting the method, the embedding efficiency is improved, the attacks of an existing high-dimensional characteristic steganalysis method are effectively resisted, and the method is especially applicable to high-safety hidden communication.
Description
technical field [0001] The invention belongs to the field of information security, and relates to a grid code encoding method based on two-layer optimal allocation ratio of embedding amount in self-adaptive steganography of space image and the application of the method in covert communication. Background technique [0002] Steganography is an important branch of information hiding technology in the field of information security. Steganography mainly studies how to embed secret information into image, audio, video and other carriers to achieve the purpose of covert communication. As a countermeasure against steganography, steganalysis uses methods such as machine learning and pattern recognition to distinguish between ordinary carriers and steganographic files. [0003] Generally, when designing a steganographic algorithm, the following factors need to be considered comprehensively: [0004] 1) Undetectable: It is required to embed the secret information into the digital car...
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IPC IPC(8): G06T9/00
Inventor 赵增振关晴骁赵险峰
Owner INST OF INFORMATION ENG CHINESE ACAD OF SCI