Information steganography method and device

Abstract

The invention relates to the field of information hiding in information security, and discloses an information steganography method and device. The method comprises the following steps: firstly pre-processing a first carrier message in need of steganography by changing feature change direction for a plurality of times to obtain a plurality of corresponding preprocessed carrier message; respectively partitioning the first carrier message and the plurality of corresponding preprocessed carrier message to obtain a plurality of first carrier sub-messages and a plurality of corresponding preprocessed carrier sub-messages; combining the plurality of first carrier sub-messages and the plurality of corresponding preprocessed carrier sub-message to obtain a new second carrier message by utilizing a block selection mode based on particle swarm optimization (PSO); and finally embedding a secret message into the new second carrier message by utilizing a steganographic algorithm. By utilizing the method and the device, a plurality of pre-processing methods are selected for pre-processing the first carrier sub-message by changing the feature change direction so that feature change has randomness, thus steganalysis can not be carried out according to laws, and blind steganalysis can be resisted.

Description

technical field [0001] The invention relates to the field of information hiding in information security, in particular to an information steganography method and device against blind analysis. Background technique [0002] Steganography is an important branch of information hiding. It uses the sensory redundancy of human sensory organs for digital signals to hide secret information in carrier information (including text, images, audio, video, etc.), and the external characteristics of the carrier after steganography There are only small changes that cannot be detected by human sensory organs, making it possible to transmit secret information while transmitting the carrier without being noticed by humans. Steganography is a means of covert communication, security and hiding capacity are its two basic requirements. [0003] Steganalysis refers to the process of detecting and judging whether there is secret information from the observed data in the case of known or unknown emb...

AI Technical Summary

Problems solved by technology

[0006] In addition, the existing algorithms that use optimization algorithms to improve steganography modify the carrier information in units of each sampling point, but the amount of calculation will increase exponentially with the increase of carrier information

For example, for an image of size 512×512, if each pixel is modified, and each pixel has 2 possible modifications, then there are 2 512×512 One possibility, if the image size becomes 1024×1024, then there will be 2 1024×1024 Such a large solution space means that it takes a lot of time and space to find the optimal solution. The data processing speed of the existing steganographic algorithm is slow and the security is not high.

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