Diffusion mapping scrambling and chaotic system combined image encryption method

An encryption method and chaotic system technology, applied in image data processing, image data processing, instruments, etc., can solve the problems of weak uneven distribution of chaotic maps, inconsistent encryption, low security, etc., to resist the attack of pixel correlation analysis, Effect of large key space, ability to resist statistical analysis

Inactive Publication Date: 2018-06-08
QINZHOU JINGTONG TECH CO LTD
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Problems solved by technology

Since the algorithm based on the chaotic system has the characteristics of pseudo-randomness and ergodicity, high efficiency and sensitivity in the initial state, it can show the expected results with high efficiency. However, some encryption schemes based on chaos have been successful. Alvarez et al. pointed out , the chaotic map has a weak non-uniform distribution, which is not suitable for the purpose of encryption. From the statistical analysis of plaintext, the establishment of this method has a low security and is fragile

Method used

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Embodiment 1

[0024] An image encryption method combining diffusion map scrambling and chaotic system, which is realized by the following steps:

[0025] Step 1, the chaotic sequence generated by the two-dimensional nonlinear dynamic system constructed by the Logistic system forms a diffusion matrix and an Arnold mapping matrix;

[0026] The specific implementation method is as follows: a two-dimensional nonlinear dynamic system is defined by the Logistic system:

[0027] Generates parameter sequences {(as, bs)} and {(dp, ep)}.

[0028] Step 2, diffuse the color image on the primary color, and scramble the color image on different bit planes;

[0029] The specific implementation method is: (1) Diffusion scrambling: take a color image G with a size of N×N, and use the linear transformation algorithm of mutual diffusion between two adjacent points to diffuse the gray value of the image pixel. The algorithm is:

[0030] in, is the diffusion matrix, gij and gij+1 are the three primary c...

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Abstract

The invention provides a diffusion mapping scrambling and chaotic system combined image encryption method, which is characterized by forming a diffusion matrix and an Arnold mapping matrix through a chaotic sequence generated by a two-dimensional nonlinear dynamical system constructed by a Logistic system; then, carrying out diffusion on a color image in primary colors, and carrying out scramblingon the color image on different bit planes; finally, carrying out encryption on a scrambled image file through a chaos sequence generated by a Chen system; and under the action of a key, generating achaos sequence through the Chen system and module operation, and carrying out multiple XOR operation to decrypt the encrypted image. The method adopts the Chen chaotic system and chaotic system combined encryption, has a very large key space and can resist key exhaustive attack; statistical distribution of the encrypted image is completely destroyed, and the method has a very good ability to resist statistical analysis; and the file encryption method can effectively resist attacks using pixel correlation analysis.

Description

technical field [0001] The invention relates to the technical field of encryption, in particular to an image encryption method combining diffusion map scrambling and a chaotic system. Background technique [0002] In recent years, image encryption algorithms or schemes have been extensively studied, and the main reason is that our digital information must be protected to avoid being copied, read, and held in public places by illegal authorization. Many methods have been proposed for the encryption of digital images, including standard data encryption, Fourier transform, obfuscation and wave transmission. Since the algorithm based on the chaotic system has the characteristics of pseudo-randomness and ergodicity, high efficiency and sensitivity in the initial state, it can show the expected results with high efficiency. However, some encryption schemes based on chaos have been successful. Alvarez et al. pointed out , the chaotic map has a weak non-uniform distribution, which ...

Claims

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Application Information

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IPC IPC(8): G06T1/00
CPCG06T1/0021
Inventor 不公告发明人
Owner QINZHOU JINGTONG TECH CO LTD
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