Image encryption method for hyper-chaotic pseudo-random sequence

A pseudo-random sequence and encryption method technology, which is applied in the field of generation, namely key generation and image transformation, can solve the problems of low practicability, low encryption algorithm efficiency, and large amount of calculation, and achieves good encryption effect and generation method. Simple and flexible, the effect of large key space

Active Publication Date: 2019-11-29
JIANGSU UNIV OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

Both types have common problems, that is, when the chaotic system iterates the equation, the amount of calculation is large, resulting in low efficiency of the encryption algorithm and poor practicability

Method used

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  • Image encryption method for hyper-chaotic pseudo-random sequence
  • Image encryption method for hyper-chaotic pseudo-random sequence
  • Image encryption method for hyper-chaotic pseudo-random sequence

Examples

Experimental program
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Effect test

Embodiment 1

[0049] Using the fourth-order hyperchaotic Chen system formula (1) as the generation model of pseudo-random sequence

[0050]

[0051] x' in formula (1) 1 , x′ 2 , x′ 3 , x′ 4 is the state parameter, x 1 , x 2 , x 3 , x 4 As a system parameter, set the parameter w 1 =35,w 2 =3,w 3 =12,w 4 =7,w 5 = 0.58.

[0052] 3. Set the initial value x1_0, x2_0, x3_0, x4_0, and provide the initial time point t_0, the end time point t_1, and the step size h, solve the formula (1), and output the hyperchaotic pseudo-random sequence {x 1}, {x 2}, {x 3}, {x 4}, the initial value of the sequence as the key.

[0053] (c) Preprocess the original image to perturb the pixel position: the perturbation relationship is shown in formula (2). Where i and j are the coordinates of the original image, i′ and j′ are the coordinates of the transformed image, the size of the image is N×N, a and b are constant coefficients, a takes 3, b takes 5, and N is any integer.

[0054]

[0055] (d...

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Abstract

The invention discloses an image encryption method for a hyper-chaotic pseudo-random sequence, and the method comprises the steps: firstly selecting a fourth-order hyper-chaotic Chen system, generating the hyper-chaotic pseudo-random sequence, and enabling an initial value of the hyper-chaotic pseudo-random sequence to serve as a secret key; secondly, preprocessing the image, defining the row-column transformation relation of the image, further disturbing the row and column of the image, and determining parameters of the row-column transformation relation dynamically by a hyperchaotic pseudo-random sequence; defining the transformation relation of the image pixel values again, wherein the parameters of the transformation relation are dynamically determined by the hyper-chaotic pseudo-random sequence; and finally, encrypting the transformed image to obtain an encrypted image. According to the invention, a pseudorandom sequence with better initial sensitivity, randomness, stability, autocorrelation and other characteristics can be flexibly and conveniently generated, so that a better secret key is obtained; and the positions and pixel values of the image pixels are dynamically disturbed, so that the correlation of the image is further reduced, the secrecy effect is further improved, the higher requirement of a user on image encryption can be met, and the practicability is higher.

Description

technical field [0001] The invention belongs to the technical field of chaotic pseudo-random sequence generation and image encryption, and specifically relates to the generation of super-chaotic pseudo-random sequence, that is, the generation of a key and an image transformation method. The sequence generation and image transformation method of the invention is especially suitable for the field of image encryption. Background technique [0002] Image encryption includes two processes, one is the selection of the key, that is, the generation of the key, and the other is the transformation of the pixel position and pixel value, that is, the use of the key. At present, one of the directions that is often discussed in nonlinear disciplines is chaotic systems. The characteristics of randomness, stationarity, and initial sensitivity of chaotic systems are widely used in encryption measures. However, due to the periodic degradation of the chaotic sequence, especially the chaotic s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/00H04L9/06H04N1/44
CPCH04L9/001H04L9/0662H04N1/44
Inventor 朱幼莲黄成宋伟徐建博
Owner JIANGSU UNIV OF TECH
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