Using gray system theory to determine the image encryption and decryption method output by ica

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...

Examples

Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0029]The specific implementation of the ICA-based image encryption and decryption method proposed by the present invention is as follows:

[0030] 1. Encryption algorithm:

[0031] The encryption end of the present invention adopts the symmetric encryption algorithm based on ICA to encrypt the plaintext image, assuming that the existing plaintext image J,

[0032] (1) Row vector straightening is performed on J plaintext images respectively to obtain J one-dimensional row straightening vectors S 1 ,S 2 ,...,S J ;

[0033] (2) First randomly select an integer as one of the random data for generating the key seed, then randomly select one from the data in the computer CPU clock register as the second random data, and use the linear congruence algorithm to generate and step (1) J one-dimensional vectors K of the same dimension as the one-dimensional r...

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...

Examples

Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0029]The specific implementation of the ICA-based image encryption and decryption method proposed by the present invention is as follows:

[0030] 1. Encryption algorithm:

[0031] The encryption end of the present invention adopts the symmetric encryption algorithm based on ICA to encrypt the plaintext image, assuming that the existing plaintext image J,

[0032] (1) Row vector straightening is performed on J plaintext images respectively to obtain J one-dimensional row straightening vectors S 1 ,S 2 ,...,S J ;

[0033] (2) First randomly select an integer as one of the random data for generating the key seed, then randomly select one from the data in the computer CPU clock register as the second random data, and use the linear congruence algorithm to generate and step (1) J one-dimensional vectors K of the same dimension as the one-dimensional r...

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