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Image encryption method based on pixel information association of hyperchaotic system

An encryption method and hyper-chaotic technology, which can be applied to secure communication through chaotic signals, encryption devices with shift registers/memory, transmission systems, etc. Low-level problems, to achieve the effect of improving the sensitivity of plaintext and improving security

Active Publication Date: 2018-03-20
BEIJING UNIV OF TECH
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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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  • Image encryption method based on pixel information association of hyperchaotic system
  • Image encryption method based on pixel information association of hyperchaotic system
  • Image encryption method based on pixel information association of hyperchaotic system

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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 pixel information association of a hyperchaotic system. The image encryption method adopts a three-stage encryption structure of image diffusion encryption, image scrambling encryption and image diffusion encryption; each stage of encryption key in the three-stage encryption structure is dynamically generated by different chaos sequencesgenerated by the hyperchaotic system, integral information of an image and information of pixel points; an x chaos sequence generated by the hyperchaotic system and position information of cleartext image pixel points generate a dynamic key for first image diffusion encryption; a key for image scrambling encryption is generated by three parts of y and z chaos sequences generated by the hyperchaotic system. Integral information of a diffusion encrypted ciphertext and data information of the diffusion encrypted ciphertext together; and a chaos sequence w and position information of scrambling encrypted ciphertext pixel points generate a dynamic key for second image diffusion encryption. The image encryption method disclosed by the invention has the characteristics of high cleartext 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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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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