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Rapid color image encryption method based on pre-storage and three-dimensional Arnold transformation

A color image and encryption method technology, which is applied in the fields of instruments, electrical digital data processing, digital data protection, etc., can solve the problems of long time consumption and low efficiency of image encryption method

Active Publication Date: 2020-07-28
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0005] Purpose of the present invention: Aiming at the low efficiency and time-consuming problems of image encryption methods, a color image fast encryption method based on pre-storage and three-dimensional Arnold transform is proposed

Method used

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  • Rapid color image encryption method based on pre-storage and three-dimensional Arnold transformation
  • Rapid color image encryption method based on pre-storage and three-dimensional Arnold transformation
  • Rapid color image encryption method based on pre-storage and three-dimensional Arnold transformation

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Embodiment Construction

[0031] The implementation process of the present invention will be further described in detail below in conjunction with specific drawings and examples.

[0032] figure 1 is the encryption flowchart of this method.

[0033] The programming software used is Matlab R2019a, select figure 2 A color image of size 512×512 is shown as the original image I . Using this method, the detailed process of encrypting the original image is described as follows.

[0034] Step 1: Calculate the transformation period: select r , g , b The values ​​of are 1, 1, 0 respectively, using the formula (1) to iterate several times, the period of the three-dimensional Arnold transformation can be obtained T =448.

[0035] Step 2: Calculate the new transformation matrix: According to formula (2), 448 new transformation matrices can be obtained B 1 , B 2 , …, B 448 .

[0036] Step 3: Store the new transformation matrix: put B 1 , B 2 , …, B 448 The element values ​​of are saved to 448 ...

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Abstract

To improve the image encryption efficiency, under the inspiration of a famous external equipment on-line parallel operation (Simultaneous Peripheral Operations On-Line, Spooling) system, an idea of changing time in space is adopted to design rapid a color image rapid encryption method based on pre-storage and three-dimensional Arnold transformation. Before encryption, T new transformation matrixesin a period are pre-calculated and are respectively stored in T text files. And during encryption, reading the corresponding new transformation matrix from the t th text file (t belongs to [1, T-1]),and new three-dimensional Arnold transformation is carried out on an original image once to obtain an encrypted image. Experiments show that the method is simple to operate and easy to implement, andthe image encryption efficiency can be obviously improved.

Description

technical field [0001] The invention relates to the technical field of encryption, in particular to a color image fast encryption method based on pre-storage and three-dimensional Arnold transformation. Background technique [0002] In the information age, a large amount of data and information are shared and used all the time. Problems such as data counterfeiting, leakage, and tampering are common, and people pay more and more attention to information security. According to statistical analysis, 75% of the information obtained by humans comes from image information. Therefore, it is of great significance to study efficient and secure image encryption methods. [0003] Image encryption methods generally have high requirements for encryption efficiency, but not high requirements for storage space overhead, that is, the size of the occupied storage space. [0004] Arnold transform is a commonly used encryption method with periodicity. However, it is computationally intensiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F21/60
CPCG06F21/602
Inventor 张晓强韩秋艺
Owner CHINA UNIV OF MINING & TECH
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