Multi-image encryption method based on three-dimensional scrambling model and fractional Fourier transform

A technology of fractional Fourier transform and encryption method, which is applied in the direction of image communication, digital transmission system, secure communication device, etc., can solve the problems of weak security and low encryption efficiency, so as to protect security, improve security, and improve The effect of the encryption effect

Active Publication Date: 2020-06-09
CHINA UNIV OF MINING & TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] Purpose of the present invention: Aiming at problems such as weak security or low encryption efficiency of existi

Method used

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  • Multi-image encryption method based on three-dimensional scrambling model and fractional Fourier transform
  • Multi-image encryption method based on three-dimensional scrambling model and fractional Fourier transform
  • Multi-image encryption method based on three-dimensional scrambling model and fractional Fourier transform

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Embodiment Construction

[0030] The implementation process of the present invention will be further described in detail below in conjunction with specific drawings and examples.

[0031] image 3 is the encryption flowchart of this method.

[0032] The programming software used is Matlab R2016a, select Figure 4 Nine images of size 512×512 are shown as original interactive images. Using this method, the detailed process of Alice encrypting the original image is described as follows.

[0033] Step 1: Image cube construction: Let the 9 original interactive images be I 1 1 , I 1 2 , …, I 1 9 , whose size is 512×512, stack them into an image cube P 512×512×9 .

[0034] Step 2: Image Cube Segmentation: Put P 512×512×9 Taking the image block with a size of 4×4×9 as the basic unit to divide into blocks, a set of 16384 image cubes is obtained R 1 .

[0035] Step 3: Chaotic sequence generation: randomly select the initial value of 2D-SLMM x 1 =0.23658956235, y 1 =0.63235658951 and contro...

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Abstract

The invention discloses a multi-image encryption method based on a three-dimensional scrambling model and fractional Fourier transform (FrFT), and belongs to the field of information encryption. At present, the data volume of network information interaction is increasingly increased, and image batch transmission and storage are often needed in practical application. In order to protect the contentof multiple images, multiple interactive images are constructed into an image cube, and the image cube is segmented into an image cube set. A three-dimensional scrambling model of an image is established by utilizing two-dimensional Zigzag transformation and a chaotic system, and pixel scrambling operation is carried out on a cubic block set of the image. Then, FrFT (Fast Fourier Transform) is carried out on the scrambling result to generate k encrypted images. Experiments show that the method can protect the content of multiple interactive images at the same time, and is high in safety, goodin encryption effect and efficient.

Description

technical field [0001] The invention relates to an information encryption technology, in particular to a multi-image encryption method. Background technique [0002] In the era of big data, huge amounts of image information are generated every day in military systems, e-government affairs, financial systems, and daily life. In order to ensure that the content of these information is not stolen, image encryption technology has attracted widespread attention in academia and industry. As a new multimedia security technology, multi-image encryption has the characteristics of high efficiency, and gradually attracts the attention of researchers. At present, researchers have proposed some multi-image encryption methods. Some of these methods have been deciphered, some have weak security, some have low efficiency, some have limited number of encrypted images, etc., which are unsatisfactory. [0003] Inspired by the 2D Zigzag transform, a stereo scrambling model is built using the...

Claims

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Application Information

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IPC IPC(8): H04N1/44H04L9/00
CPCH04L9/001H04N1/44
Inventor 张晓强胡杨明
Owner CHINA UNIV OF MINING & TECH
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