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Cat mapping and chaos based image information fusion and encryption method

An encryption method and image information technology, which is applied in the field of image processing, can solve problems such as security restrictions, low security, and poor security, and achieve high security and reduce correlation effects

Active Publication Date: 2017-05-24
XIDIAN UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Its shortcomings are: 1. Chaotic sequence alone is not enough to scramble the pixels in the image, and it does not have a good effect of scrambling combined with generalized cat face transformation, so the security is not high; 2. The length of the chaotic sequence is limited. The scope is only limited to the length of the sum of the length and width of the image or the length equal to the image size, without using more chaotic sequences, and the security is limited to a certain extent; 3. The operation of XOR operation is too simple, compared to The effect of encryption combined with chaotic sequence and image information fusion technology is poor, so the security is relatively poor

Method used

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  • Cat mapping and chaos based image information fusion and encryption method

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Embodiment Construction

[0029] refer to figure 1 , the specific implementation steps of the present invention are as follows:

[0030] Step 1, input an N×N grayscale image F, and obtain the two-dimensional matrix f(s, t) of the grayscale image.

[0031] Call the imread function to read in an N×N grayscale image as the image to be encrypted, such as figure 2 shown, get the

[0032] The two-dimensional matrix f(s,t) of the grayscale image, N=256 at this time.

[0033] Step 2, perform 10 generalized cat face transformations on the two-dimensional matrix f(s,t) of the grayscale image to obtain the scrambled image

[0034] matrix f 1 (s, t).

[0035] The generalized cat face transformation formula is as follows:

[0036]

[0037] in It is called the transformation matrix, a and b are two different parameters of the transformation matrix; x and y are the abscissa and ordinate before the transformation respectively; x′ and y′ are the abscissa and ordinate after the generalized cat face transform...

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Abstract

The invention discloses a cat mapping and chaos based image information fusion and encryption method, which mainly solves a problem that an existing technology of performing encryption on an image by using a chaotic system is insufficient in scrambling and relative poor in safety. Implementation of the method comprises the steps of 1, performing generalized Arnold transformation on an image to acquire a preliminary scrambling image; 2, acquiring a chaos generation image matrix with the length and width being four times of those of the image to be encrypted by using a generalized three-dimensional Henon hyper-chaotic system; 3, acquiring a binary substring sequence for scrambling by using Lorentz chaos; 4, inserting the preliminary scrambling image into the chaos generation image matrix by using the binary substring sequence to acquire an image matrix after insertion; and 5, reducing the image matrix after insertion by using an image information fusion technology so as to acquire a final encrypted image. The method disclosed by the invention is high in scrambling degree and high in sensitivity, improves the safety of image encryption and can be applied to information security.

Description

technical field [0001] The invention belongs to the technical field of image processing, in particular to an image encryption method, which can be used for information security. Background technique [0002] With the rapid development of computer technology, network technology and multimedia technology, after successfully solving the storage and transmission bottleneck caused by the large amount of digital image data, digital image has become the mainstream of information expression. However, there are still many hidden dangers in the transmission of digital images. The security of image information is not only related to personal privacy and business secrets of enterprises, but more importantly, it is related to the security of the country, especially military secrets. Therefore, the security of image information valued. Image encryption technology is the most direct and effective means to protect image security, and has become an important hot topic in information encrypt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00G06T5/40
CPCG06T1/00G06T5/40
Inventor 魏德运董晟邓斌李远敏姜湖月
Owner XIDIAN UNIV
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