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

A technology of fractional Fourier and encryption methods, which is applied in image data processing, image data processing, digital data protection, etc., can solve the problems of weak security and low encryption efficiency, and achieve security protection, security improvement, The effect of improving the encryption effect

Pending Publication Date: 2020-05-08
CHINA UNIV OF MINING & TECH
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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 in 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

[0033] The implementation process of the present invention will be further described in detail below in conjunction with specific drawings and examples.

[0034] Figure 4 is the encryption flowchart of this method.

[0035] The programming software used is Matlab R2016a, select Figure 5 Nine images of size 512×512 are shown as the original image set. Using this method, Alice's encryption process is detailed as follows.

[0036] Step 1: Image cube construction: Let the 9 original images be I 1 1 , I 1 2 , …, I 1 9 , the size of which is 512×512, the 9 original images are superimposed into a 9-layer image cube B 1 , with a size of 512×512×9.

[0037] Step 2: Randomly select the initial value of the five-dimensional hyperchaotic system x 1 =0.236542532712, y 1 =0.361425721124, z 1 =0.625121457935, u 1 =0.152365227495 and v 1 =0.812165374593; Iterate the system 262144 times to obtain 5 chaotic sequences X ={ x i} 262144 , Y ={ y i} 262144 , Z ={ z ...

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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 the image batch transmission and storage requirements are increased. The invention provides the multi-image encryption method based on the three-dimensional scrambling model and FrFT in order to protect the security of network transmission of content of multiple images. Under the inspiration of scrambling andrestoring of a three-dimensional magic cube, a plurality of images form an image cube structure, a three-dimensional row, column and layer scrambling mode is designed, and a three-dimensional scrambling model is established. The k original images are scrambled by using the scrambling model, and FrFT is performed on a scrambled image set to generate k encrypted images. Experiments show that the method can encrypt a plurality of interactive images at the same time, and is good in encryption effect, high in safety 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, in many fields such as military systems, e-government affairs, financial systems and daily life, huge image information is generated every day. In order to ensure that the content of these information is not stolen, image encryption technology has attracted widespread attention in the scientific research and industrial circles. As a new multimedia security technology, multi-image encryption has the characteristics of high efficiency, and gradually attracts the attention of researchers. 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 Rubik's cube scrambling and restoration, a three-...

Claims

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Application Information

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IPC IPC(8): G06T1/00G06F21/60
CPCG06T1/0021G06F21/602
Inventor 张晓强胡杨明
Owner CHINA UNIV OF MINING & TECH
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