An image encryption method based on H geometric fractal and a Hilbert curve

An encryption method and curve technology, applied in image data processing, image data processing, instruments, etc., can solve the problems of short-period response, finite precision effect, precision and confidentiality, and achieve the effect of resisting statistical attacks

Active Publication Date: 2019-06-18
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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Problems solved by technology

[0004] Aiming at the technical problems that a single chaotic system used for image encryption will cause short-period response, finite precision effect, and the contradiction between precision and confidentiality, the present invention proposes an image encryption method base

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  • An image encryption method based on H geometric fractal and a Hilbert curve
  • An image encryption method based on H geometric fractal and a Hilbert curve
  • An image encryption method based on H geometric fractal and a Hilbert curve

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Embodiment Construction

[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0047] Such as figure 1 Shown, a kind of image encryption method based on H geometric fractal and Hilbert curve, its steps are as follows:

[0048] Step 1: Read the grayscale image P with a size of M×N, and convert the grayscale image P into a two-dimensional image matrix P with a size of M×N 1 .

[0049] Convert the grayscale image P into a two-dimensional image matrix P of the same size 1 , followed by digital processing through a two-dimensional matrix, ...

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Abstract

The invention provides an image encryption method based on H geometric fractal and a Hilbert curve. The image encryption method comprises the following steps: calculating a hash value of the originalgray level image as an initial value of a chaotic system by using an SHA-3 algorithm, and carrying out bitwise ratio specificity or diffusion on image pixels by using a sequence generated by the chaotic system; And alternately carrying out diffusion operation and two-dimensional Hilbert scanning curve scrambling operation by using the second-order H fractal to obtain an encrypted image. Accordingto the invention, Hilbert curve scanning scrambling and H geometric fractal diffusion are adopted, and a chaotic system, DNA coding, a Hilbert scanning curve and H fractal are combined to realize tworounds of pixel position scrambling and pixel value diffusion; Experimental results and security analysis show that the method not only has enough key space to resist exhaustive attacks, but also canresist statistical attacks, differential attacks, data loss attacks and noise attacks, and is widely applicable to secure transmission of image information.

Description

technical field [0001] The invention relates to the technical field of image encryption, in particular to an image encryption method based on H geometric fractal and Hilbert curve. Background technique [0002] With the rapid development of Internet technology and multimedia technology, the issue of secure transmission of information such as images, videos, and audios has drawn more and more attention. Traditional encryption algorithms such as RSA and DES have certain shortcomings due to encryption speed, key space, high correlation between adjacent pixels, large data volume, and high redundancy. Therefore, it is imperative to explore new encryption methods. . As a complex nonlinear dynamic system, chaotic system has the characteristics of extreme sensitivity to initial parameters and initial values, pseudo-randomness, etc., which is consistent with the characteristics of cryptography, so it is widely used in the encryption of image information. In 2004, Chen et al propose...

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Application Information

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IPC IPC(8): G06T1/00
Inventor 牛莹张勋才付金华乔晓芳周正曹祥红
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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