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Image encryption method based on splicing model and hyper-chaotic system

An encryption method and ultra-chaotic technology, applied in image coding, image data processing, instruments, etc., can solve the problems of low encryption technology efficiency, DNA coding limitation, and slow coding speed, so as to improve encryption efficiency, simplify operations, and improve safety effect

Inactive Publication Date: 2015-07-08
DALIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology is very complicated and has a large amount of calculation, so the efficiency of this encryption technology is very low
[0005] In the past, encryption algorithms used more binary representations of image information. Since the encoding must satisfy the principle of complementary base pairing, DNA encoding is limited.
At the same time, because the image information needs to be converted into binary first, the encoding speed is relatively slow

Method used

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  • Image encryption method based on splicing model and hyper-chaotic system
  • Image encryption method based on splicing model and hyper-chaotic system
  • Image encryption method based on splicing model and hyper-chaotic system

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Embodiment 1

[0047] The embodiments of the present invention are implemented on the premise of the technical solutions of the present invention, and detailed implementation methods and specific operation processes are given, but the protection scope of the present invention is not limited to the following embodiments.

[0048] Step 1. Split the original image A(m,n) into four parts by converting decimal to quaternary, and each part is represented by a matrix as RA, RB, RC, RD;

[0049] Step 2, encode RA, RB, RC, RD into DNA sequence matrices EA, EB, EC, ED with DNA coding rules;

[0050] Step 3. Use Chen's hyperchaotic map to generate chaotic sequence (x, y, z, q)

[0051] Given any initial key, and calculate the sum of all pixel values ​​of the original image; add the initial key and the sum of all pixel values ​​​​as the encryption key; divide the encryption key into four parts as the initial value of the chaotic map ; Four chaotic sequences x=(x 1 ,x 2 ,...,x n ), y=(y 1 ,y 2 ,......

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Abstract

The invention discloses an image encryption method based on a splicing model and a hyper-chaotic system, and relates to the field of image encryption. The hyper-chaotic system and the splicing model of a DNA calculation are introduced to the process of image encryption. Firstly, a pixel value is disintegrated into four integers ranging from zero to three by using a mode of converting decimalism to quaternion; secondly, the obtained four integers are coded by using basic groups of A, G, C and T respectively, an original gray level image can be disassembled into four parts, and operations can be conducted on the four parts respectively; in addition, the method takes full advantage of a basic idea of the splicing model to form a splicing operation, and the splicing operation is applied to pixel values of a scrambling image. According to a simulated result and safety analysis, not only are large key space and high sensibility provided, but also an exhaustive attack, a statistical attack and a difference attack can be resisted, and the encryption effect is good.

Description

technical field [0001] The invention relates to an image encryption method based on a splicing model and a hyperchaotic system, in particular to a method for encrypting an original image by using a quaternary code and a splicing model, which belongs to the field of image encryption. Background technique [0002] As digital images are widely used as an information carrier in the network, it has become more and more important to protect the security of digital image information. Image encryption is the most effective way to protect image information, and researchers have proposed many image encryption techniques. The chaotic system is sensitive to the initial value and the DNA computing has the characteristics of high parallel computing capability and high storage density, so the image encryption technology based on the chaotic system and DNA computing is favored by people. [0003] The characteristics of the chaotic system are naturally related to natural cryptography, so si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T9/00
Inventor 周昌军牛红叶王宾张强
Owner DALIAN UNIV
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