Image Encryption Method Combining 3D Arnold Transform and Chaotic Sequence

A technology of chaotic sequence and encryption method, applied in image data processing, image data processing, instruments, etc., can solve the problems of low efficiency of image scrambling and low security of image encryption algorithm

Inactive Publication Date: 2016-06-08
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology

[0005] The present invention aims at the problem that the security of the image encryption algorithm realized by a single chaotic map is low, and the image scrambling efficiency is not high, and proposes an image encryption method combining a three-dimensional Arnold transformation and a chaotic sequence, using a three-dimensional Arnold transformation for scrambling , and then combined with the chaotic sequence to encrypt the digital image, this method improves the security of image encryption

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  • Image Encryption Method Combining 3D Arnold Transform and Chaotic Sequence
  • Image Encryption Method Combining 3D Arnold Transform and Chaotic Sequence
  • Image Encryption Method Combining 3D Arnold Transform and Chaotic Sequence

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Embodiment Construction

[0030] The image encryption method combining the three-dimensional Arnold transformation and the chaotic sequence first processes the image, transforms it into a multi-dimensional image, and obtains its pixel value data matrix, then performs several three-dimensional Arnold scrambling transformations, and then uses the Logistic chaotic sequence and the image to perform step-by-step encryption. Bitwise XOR operation to change the pixel values ​​of the image. Specific as figure 1 with figure 2 Shown is the encryption and decryption flowchart of the present invention.

[0031] 1. Three-dimensional Arnold transformation:

[0032] Extend the two-dimensional Arnold transform into a three-dimensional Arnold transform, the form of which is as follows:

[0033] modN(1)

[0034] where matrix is called the transformation matrix, Indicates the coordinate position of the image pixel before the three-dimensional Arnold transformation, Indicates the coordinate position of the im...

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Abstract

The invention relates to an image encryption method combining a three-dimensional Arnold transformation and a chaotic sequence. First, the image is processed, transformed into a multi-dimensional image, and its pixel value data matrix is ​​obtained, and then several times of three-dimensional Arnold scrambling transformation is performed, and then the Logistic The chaotic sequence performs bitwise XOR operation with the image to change the pixel value of the image. The three-dimensional Arnold transform is used to scramble the pixel positions of the processed multi-dimensional image data. Compared with the general two-dimensional scrambling technology, the scrambling degree is higher, and then the chaotic sequence is used to change the pixel value to complete the encryption, which is safe. It has the advantages of good performance, strong key sensitivity, and strong anti-attack ability.

Description

technical field [0001] The invention relates to an information security technology, in particular to an image encryption method combining a three-dimensional Arnold transformation and a chaotic sequence. Background technique [0002] Scientific research and statistics show that about 75% of the information that humans obtain from the outside world comes from image information. However, due to the openness of the network, the security and confidentiality of image data has attracted more and more attention. How to protect image data information has become an important issue for people. issues of general concern. [0003] Chaotic signals can be used to encrypt images due to their high sensitivity to initial conditions. The image encryption methods based on chaos can be divided into two categories: pixel position scrambling and pixel value scrambling. Traditional encryption algorithms based on chaos usually use a single chaotic system for encryption. A large number of literatur...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/00
Inventor 杜翠霞张定会张宗楠
Owner UNIV OF SHANGHAI FOR SCI & TECH
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