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Color image chaotic encryption method

A color image and chaotic encryption technology, which is applied in image data processing, image data processing, instruments, etc., can solve the problem of slow encryption speed due to the complexity of massive calculation of image data, so as to increase the difficulty of deciphering and good scrambling Sexuality, the effect of strong resistance to attack

Inactive Publication Date: 2018-06-08
QINZHOU JINGTONG TECH CO LTD
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Problems solved by technology

In the image encryption algorithm, people usually choose the traditional encryption algorithm, such as DES, RSA and other encryption algorithms, but the traditional encryption algorithm does not consider the mass of image data, which causes the complexity of calculation and finally slows down the encryption speed.

Method used

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Embodiment 1

[0017] A chaotic encryption method for color images is implemented by the following steps: Step 1, optimize the Lorenz chaotic sequence: when the Lorenz system enters a chaotic state, construct a mathematical model: Among them, x', y', z' are the optimized real-valued chaotic sequence; m is the control parameter, through which the irregularity of the sequence value can be improved; round() is the closest integer function.

[0018] Step 2, use the optimized chaotic sequence x', y', z' to generate three scrambling matrices, respectively scrambling the three components of the RGB color image:

[0019] (1) The method of generating the permutation matrix: use the optimized chaotic sequence to generate the corresponding permutation matrix PM×N, for PM×N, any element Pij∈[1,2,…,M×N], and Pij =Pkl, if and only if i=k, j=1. For example: when M=4, N=4, P is a 4×4 matrix, and the chaotic sequence composed of 16 real values ​​generated by the optimized chaotic sequence is: 10.95621370, ...

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Abstract

The invention provides a color image chaotic encryption method and belongs to the technical field of encryption. The method is realized through the following steps: optimizing a Lorenz chaotic sequence; generating three scrambling matrixes by utilizing the optimized chaotic sequences x', y' and z', and carrying out scrambling on three components of an RGB color image; carrying out block encryption; outputting a scrambled color image, and synthesizing the scrambled three-primary-color images to obtain an encrypted image; and decrypting the image. The algorithm carries out scrambling on three primary color components of the color image through Px, Py and Pz in a spatial domain range, thereby enhancing strength of algorithm diffusion, and further increasing decoding difficulty; the three primary color components are scrambled respectively, so that the encrypted image is allowed to have color change in the visual sense, and the image is more difficult to read; meanwhile, scrambling degreeof the adopted algorithm is similar to the scrambling degree of magic square transformation, so that the method has good scrambling performance; and the method has higher anti-attack ability.

Description

technical field [0001] The invention relates to the technical field of encryption, in particular to a chaotic encryption method for color images. Background technique [0002] With the rapid development of multimedia technology and Internet technology, people can conveniently conduct various exchanges through the network, including information such as images, voices, videos, and texts, and the accompanying problems of how to ensure the security and confidentiality of these information appear more and more important. Color image processing is an important part of digital image processing. In network and multimedia communication, color image file encryption is often involved. In the image encryption algorithm, people usually choose the traditional encryption algorithm, such as DES, RSA and other encryption algorithms, but the traditional encryption algorithm does not consider the mass of image data, which causes the complexity of the calculation and finally slows down the enc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
CPCG06T1/00
Inventor 不公告发明人
Owner QINZHOU JINGTONG TECH CO LTD
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