Image encryption and decryption method for utilizing gray system theory to confirm ICA output

Abstract

The invention provides an image encryption and decryption method for utilizing the gray system theory to confirm ICA output. The method comprises the steps of adopting the symmetric encryption algorithm based on ICA to conduct encryption work; adopting the Fast ICA algorithm to solve figures at the encryption end. If the sequence of encryption output images is not confirmed, using main components to analyze main components of the images, using the component data of the main components as model building data of a gray model, conducting gray association analysis on the images, and conducting Deng-type gray correlation degree calculation so as to obtain the gray correlation degree of the images. Sequences with the largest gray correlation degree are corresponding clear images and decrypted images. Image characteristic extracted through the method are accurate, and characterized data volume is not influenced by image blocks and image patterns, identification data volume is small, the algorithm speed is fast, manual threshold setting is not needed for judgment, and the problem that the decrypted output image sequence is not confirmed is well solved.

Description

technical field [0001] The invention relates to the technical field of image information security, in particular to an image encryption and decryption method. Background technique [0002] With the rapid development of computer network and multimedia technology, image information is widely used in finance, e-commerce and government affairs, as well as various personal businesses. Image information security has become an important research topic in the field of information security technology. [0003] Image encryption is the most direct method to protect the security of image information. Image information itself has redundancy and correlation, which makes image encryption methods different from traditional cryptography methods, and most of the existing image encryption methods are computationally secure rather than unconditionally secure. With the continuous improvement of computer computing power, current computationally secure encryption methods cannot ensure its future...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiencies of the prior art, and aiming at the imperfect structure of the underdetermined matrix of the existing blind source separation image encryption method and the uncertain decryption output sequence, the present invention proposes an image encryption and decryption method using the gray system theory to determine the output of the ICA, Improve and expand the construction space of the existing underdetermined encryption matrix to further improve the encryption and decryption algorithm based on ICA. At the same time, it overcomes the shortcomings of traditional feature extraction methods that are not universal, and solves the problem of uncertain sequence of decrypted output images.

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