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Chaotic image encryption method based on area-preserving Baker mapping

An encryption method, image technology, applied in image analysis, image data processing, image data processing and other directions

Inactive Publication Date: 2016-11-16
GUANGDONG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, because the chaotic system in this paper uses a quantum chaotic system that is more complex than ordinary chaos, the addition of disturbances in the quantum chaotic system makes the chaotic system more non-periodic, and the sequence randomness is stronger. At the same time, the "fixed point" of the ordinary chaotic system and "stability window" issues have also been improved and resolved

Method used

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  • Chaotic image encryption method based on area-preserving Baker mapping
  • Chaotic image encryption method based on area-preserving Baker mapping
  • Chaotic image encryption method based on area-preserving Baker mapping

Examples

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Embodiment

[0033] Such as figure 1 , the specific process of image encryption based on the chaotic image encryption method of the area-preserving Baker map is as follows:

[0034] (1) Select as above figure 2 The images shown with a size of 256×256 are the experimental objects.

[0035] (2) Segment the image: set k value, choose k=32 here. Divide the picture into 32 rectangular blocks along the horizontal direction. Each rectangular block has 256×8 pixels. Then divide the image into 8 rectangular blocks along the vertical direction, then each small rectangle consists of 256 pixels, and the size of each rectangular block is 32×8.

[0036] (3) In each divided rectangular block of size 32×8, the position of each pixel is sequentially read from left to right and from top to bottom (that is, the coordinates of the first pixel are (0, 0), and so on) to get the following sequence:

[0037] ( 0 , 0...

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Abstract

The invention relates to an image encryption method, and particularly relates to a chaotic image encryption method based on area-preserving Baker mapping. The method has a simple process, the space-time complexity can be enhanced, the computer precision restriction problem can be solved, and the encryption algorithm complexity can be increased. Meanwhile, as the chaotic system of the invention adopts a quantum chaotic system which is more complex that a common chaotic system, in the quantum chaotic system, the addition of disturbing momentum enables the chaotic system to be better in aperiodicity and stronger in sequence randomness, and problems of a fixed point and a stable window existing in the common chaotic system can be improved and solved.

Description

technical field [0001] The invention relates to an image encryption method, in particular to a chaotic image encryption method based on area-preserving Baker mapping. Background technique [0002] Traditional encryption methods (such as DES, RSA, etc.) are used in an environment with a small amount of data, although they can effectively protect multimedia copyrights and enhance data security. However, multimedia data (including video, audio, image, etc.) has strong correlation and a large amount of data. Using traditional encryption methods requires a lot of system overhead in most occasions. Therefore, any operation that may increase the complexity of the algorithm will reduce the efficiency of the entire encryption system and affect the practical effect. [0003] The chaotic system is very sensitive to the initial value, the initial state changes slightly, and the chaotic sequence produced after iteration is quite different. Moreover, the chaotic sequence also has good ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00G06F21/10G06T7/00
CPCG06F21/10G06T1/00
Inventor 谢国波杨彬
Owner GUANGDONG UNIV OF TECH
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