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A Block-Based Double-layer Adaptive Diffusion Image Encryption Method

An encryption method and self-adaptive technology, applied in the field of image processing, can solve problems such as plaintext, low key sensitivity, difficulty in resisting chosen plaintext attacks, and large amount of digital image data

Inactive Publication Date: 2018-06-15
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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  • A Block-Based Double-layer Adaptive Diffusion Image Encryption Method
  • A Block-Based Double-layer Adaptive Diffusion Image Encryption Method
  • A Block-Based Double-layer Adaptive Diffusion Image Encryption Method

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Embodiment Construction

[0067] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0068] 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) i5-2400CPU@3.10GHz 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.

[0069] 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.

[0070] 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 block double-layer self-adaptive diffusion digital image encryption method. Using Logistic mapping, Tent mapping and Sine mapping, three new one-dimensional chaotic maps are constructed by pairwise combination, and the initial chaotic sequence is extracted to make it have a wider chaotic range and better chaotic behavior; then by combining Arnold positive and negative Direction mapping, which synchronizes scrambling and diffusion, not only can make the access order of each pixel and the storage order of each position equal, enhance the randomness of scrambling, overcome the defects of regular Arnold mapping from regular to random access, but also in In the process of scrambling, block-by-block double-layer adaptive diffusion is used, and the interaction between ciphertext pixels, ciphertext pixels, plaintext pixels and chaotic random sequences is used to diffuse the influence of each pixel nonlinearly into the entire image matrix, and During the diffusion process, the chaotic system is continuously disturbed to form an adaptive diffusion process, which enhances the sensitivity of the encrypted image to the key, ciphertext and plaintext.

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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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/00
Inventor 张绍武徐亚宋金林
Owner NORTHWESTERN POLYTECHNICAL UNIV
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