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Fractional domain image encryption method based on Arnold transformation and compound chaos

An encryption method and fractional domain technology, applied in the field of image processing, can solve the problems of low key sensitivity and being deciphered, and achieve the effect of enhancing robustness, high security, and reducing correlation

Inactive Publication Date: 2016-03-30
XIDIAN UNIV
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  • Application Information

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Problems solved by technology

However, the sensitivity of the key encrypted using fractional Fourier transform alone is not high, and there is a great risk of being deciphered

Method used

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  • Fractional domain image encryption method based on Arnold transformation and compound chaos
  • Fractional domain image encryption method based on Arnold transformation and compound chaos
  • Fractional domain image encryption method based on Arnold transformation and compound chaos

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Embodiment Construction

[0028] The concrete implementation of the present invention comprises encryption and decryption two parts:

[0029] 1. Reference figure 1 , the encryption steps of the present invention are as follows:

[0030] Step 1, input the image to be encrypted, and obtain its two-dimensional image matrix f(s,t).

[0031] Call the imread function to read in a N×N grayscale image cameraman that comes with MATLAB software as the image to be encrypted, such as image 3 As shown, the two-dimensional image matrix f(s, t) is obtained, and N=256 at this time.

[0032] Step 2, perform 100 generalized Arnold transformations on the image matrix f(s,t) to obtain the scrambled image matrix f 1 (s, t).

[0033] The generalized Arnold transform formula is as follows:

[0034] x ′ y ′ ...

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Abstract

The invention discloses a fractional domain image encryption method based on Arnold transformation and compound chaos and mainly solves the problems that the scrambling degree is low, the secret key sensitivity is low and the robustness is poor in the prior art. The method comprises the following implementation steps: (1), carrying put generalized Arnold transformation on an image so as to obtain the preliminarily scrambled image; (2), carrying out random phase encoding on the scrambled image so as to obtain the encoded image; (3), carrying out fractional Fourier transformation on the encoded image so as to obtain the transformed image; (4), generating a sequence used for scrambling by using a compound chaotic system and processing the sequence so as to obtain the processed chaos sequence; and (5), carrying out secondary scrambling on the transformed image by using the processed chaos sequence so as to obtain a final encrypted image. The method is high in scrambling degree, strong in sensibility, and good in robustness, improves image transmission security and can be applied to information security.

Description

technical field [0001] The invention belongs to the technical field of image processing and relates to an image encryption method, which can be used for information security. Background technique [0002] Digital image is one of the most popular forms of multimedia at present, and it is widely used in politics, economy, national defense, education and so on. Image encryption is an important issue in the field of information security, so both image information transmission and image encryption technology have attracted widespread attention. In recent years, the use of fractional Fourier transform and chaotic systems to encrypt images has attracted the attention of relevant researchers. [0003] Encrypting an image usually changes the image pixel location and pixel value. Arnold transform is a commonly used scrambling technique proposed by Russian mathematician V.J.Arnold. Because of its relatively simple calculation and easy implementation, it is often used in image encryp...

Claims

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Application Information

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IPC IPC(8): G06F21/60
CPCG06F21/602
Inventor 魏德运王睿岿邓斌李远敏董晟
Owner XIDIAN UNIV
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