Partitioning double-layer self-adaptation diffusion image encryption method

An encryption method and adaptive technology, applied in the field of image processing, can solve the problems of plain text, low key sensitivity, high redundancy, and large amount of digital image data

Inactive Publication Date: 2015-07-08
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of large amount of digital image data, high redundancy, low sensitivity of existing image encryption methods to plaintext and keys, and difficulty in resisting chosen plaintext attacks, etc. Diffusion image encryption method, good encryption effect and high security, providing guarantee for safe storage and transmission of digital images

Method used

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  • Partitioning double-layer self-adaptation diffusion image encryption method
  • Partitioning double-layer self-adaptation diffusion image encryption method
  • Partitioning double-layer self-adaptation diffusion image encryption method

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Embodiment Construction

[0068] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0069] Using a general-purpose microcomputer, various image encryption simulation systems are developed in the MATLAB R2010b programming environment. The program runs on a computer with Intel(R) core(TM) i5-2400CPU3.10GHz and 4GB memory. Select 512×512 animal pictures, long-range pictures, close-up pictures, and satellite pictures, and 256×256 human figures and binary pictures, and 6 different types of standard test images for encryption simulation experiments.

[0070] Step 1: Take the 256×256 image of the character Lena as an example for specific description. Assuming t=16, the initial encryption matrix is ​​divided into 16×16 matrix sub-blocks.

[0071] Step 2: Set the initial key Key1 to [x 10 , x 20 , x 30 , μ 1 , μ 2 , μ 3 , k 1 ] = (0.5678, 0.4321, 0.3789, 2.1345, 3.1367, 1.1221, 123). x 10 , x 20 , x 30 , μ 1 , μ 2 , μ 3 are the ...

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Abstract

The invention provides a partitioning double-layer self-adaptation diffusion image encryption method. The partitioning double-layer self-adaptation diffusion image encryption method includes the steps that every two kinds of Logistic mapping, Tent mapping and Sine mapping are combined to build three kinds of new one-dimensional chaotic mapping, and initial chaotic sequences are extracted, so that the new one-dimensional chaotic mapping has wide chaotic ranges and good chaotic behaviors; then scrambling and diffusion are synchronously carried out by combining Arnold forward mapping and Arnold backward mapping. The opportunities of accessing sequences of pixels and the opportunities of storage sequences of positions can be equal, the scrambling randomness can be improved, and the defects in the rules and random accessing of conventional Arnold mapping can be overcome; in addition, partitioning double-layer self-adaptation diffusion is adopted in the scrambling process, the interaction between the ciphertext pixels, the interaction between the ciphertext pixels and the plaintext pixels and the interaction between the ciphertext pixels and chaotic random sequences are used, influences of the pixels are nonlinearly diffused into a whole image array, a chaotic system is continuously disturbed in the diffusion process, a self-adaptation diffusion process is formed, and the sensitivity of an encryption image to a secret key, a ciphertext and a plaintext is improved.

Description

technical field [0001] The invention relates to an image processing method, mainly an image encryption method. Background technique [0002] With the continuous development of network technology, digital images have become the main carrier of information transmission due to their intuition and image, and have been widely used in national defense, aerospace, military, political, economic and other fields, but in the process of image storage, transmission and use There is a certain risk of leakage. Therefore, seeking efficient digital image encryption technology has important theoretical significance and engineering application value. At present, according to the characteristics of digital images, various encryption methods based on matrix transformation / pixel scrambling, encryption methods based on modern cryptosystems, encryption methods based on chaotic systems, encryption methods based on neural networks, encryption methods based on DNA coding, and more Encryption method...

Claims

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Application Information

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IPC IPC(8): G06T1/00
Inventor 张绍武徐亚宋金林
Owner NORTHWESTERN POLYTECHNICAL UNIV
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