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An Image Encryption Method Based on Hyperchaotic System Pixel Information Association

A hyper-chaotic, image technology, applied in secure communication through chaotic signals, encryption devices with shift registers/memory, transmission systems, etc., can solve the problem of small information entropy, weak resistance to differential attacks, and low ciphertext sensitivity and other issues to achieve the effect of improving security and improving the sensitivity of plaintext

Active Publication Date: 2021-02-05
BEIJING UNIV OF TECH
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  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of small information entropy, low ciphertext sensitivity, and weak ability to resist differential attacks after image encryption. This paper proposes an image encryption method based on hyperchaotic system pixel information association.

Method used

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  • An Image Encryption Method Based on Hyperchaotic System Pixel Information Association
  • An Image Encryption Method Based on Hyperchaotic System Pixel Information Association
  • An Image Encryption Method Based on Hyperchaotic System Pixel Information Association

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Embodiment Construction

[0026] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings. figure 1 It is the encryption frame diagram involved in the present invention.

[0027] Step 1: Generate a chaotic sequence using a hyperchaotic system

[0028] What is used in this image encryption method is the Lorenz hyperchaotic system. The Lorenz hyperchaotic system is a four-dimensional high-dimensional chaotic system, which has the characteristics of complex structure, high randomness and unpredictability. Its four state values ​​are disorderly and disorderly, and there is a nonlinear relationship between any two state values. The hyperchaotic Lorenz system is defined as follows:

[0029]

[0030] In the above equation, a, b, c, r are system parameters, where a=10, b=8 / 3, c=28, and the value range of parameter r is [-1.52-0.06]. When r=-1, the hyperchaotic system has four Lyapunov exponents: 0.3381, 0.1586, 0, and -15.1752. x, y, ...

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Abstract

The invention discloses an image encryption method based on the association of pixel information of a hyper-chaotic system, which adopts a three-level encryption structure of image diffusion encryption, image scrambling encryption and image diffusion encryption. Different chaotic sequences generated by the chaotic system, the overall information of the image and the information of the pixel points are dynamically generated; the x chaotic sequence generated by the hyper-chaotic system and the position information of the plaintext image pixels generate the dynamic key for the first image diffusion encryption; The key of scrambling encryption is jointly generated by the y and z chaotic sequences of the hyperchaotic system, the overall information of the diffused encrypted ciphertext, and the data information of the diffused encrypted ciphertext; the chaotic sequence w and the position of the pixels of the scrambled encrypted ciphertext The information generates the dynamic key for the second image diffusion encryption. The invention has the characteristics of high plaintext sensitivity, large key space and high ciphertext information entropy.

Description

technical field [0001] The invention belongs to the technical field of chaotic systems and image encryption, in particular to an image encryption method based on hyperchaotic system pixel information association, and the image encrypted by this method has the characteristics of high plaintext sensitivity, large key space, and high ciphertext information entropy . Background technique [0002] With the rapid development of network and computer technology, digital images have been widely used in social, education, national defense and other fields. Due to the openness of the network and unauthorized access, the security of the image is greatly threatened, which has aroused widespread concern at home and abroad. Image encryption technology has always been a hot and difficult research point at home and abroad, and universities and research institutions have invested a lot of manpower and financial resources in research. Digital image encryption research has always been an impo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/16H04L9/14H04L9/06H04L9/00G06F21/60
CPCG06F21/602H04L9/001H04L9/0618H04L9/0631H04L9/14H04L9/16
Inventor 段立娟张东魁宁振虎
Owner BEIJING UNIV OF TECH
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