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Image encryption method based on chaotic system and two-dimensional reversible cell automaton

A chaotic system and encryption method technology, applied in the field of image processing, can solve the problem of unable to obtain hidden information effect cipher text images, etc., and achieve the effects of good application value, small key space and high sensitivity

Inactive Publication Date: 2018-01-19
GUIZHOU AEROSPACE INST OF MEASURING & TESTING TECH
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  • Abstract
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide an image encryption method based on a chaotic system and a two-dimensional reversible cellular automaton, so as to solve the problem that the prior art can not obtain a good effect of hiding information under the condition of a low number of iterations The ciphertext image of

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  • Image encryption method based on chaotic system and two-dimensional reversible cell automaton
  • Image encryption method based on chaotic system and two-dimensional reversible cell automaton
  • Image encryption method based on chaotic system and two-dimensional reversible cell automaton

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Embodiment 1

[0046] Such as figure 1 Shown, the present invention comprises the following steps:

[0047] S1: The pixel matrix of the image to be encrypted is processed according to certain rules in the horizontal, vertical and diagonal directions to obtain three coefficients;

[0048] The specific process of step S1 is as follows:

[0049] The pixel matrix of the image to be encrypted is its pixel matrix P M×N , respectively take the pixel values ​​in the three directions of horizontal, vertical and diagonal, and calculate according to the following formula to obtain three coefficients α, β, γ:

[0050]

[0051] In the formula, M and N represent the rows and columns of the image pixel matrix respectively, mod is the modulo operation symbol, is the bitwise XOR operation symbol, P is the pixel matrix of the image to be encrypted,

[0052] S2: Treat the three coefficients generated by S1 as the initial values ​​of the Lorenz chaotic system to generate three sets of sequences X k ,...

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Abstract

The invention discloses an image encryption method based on a chaotic system and a two-dimensional reversible cell automaton. The image encryption method comprises the steps of S1, processing the pixel values of the pixel matrix of a to-be-encrypted image in three directions of the horizontal direction, the vertical direction and the diagonal-line direction to obtain three coefficients; S2, adopting the three coefficients generated in the step S1 as the initial values of a Lorenz chaotic system so as to generate three sets of sequences Xk, Yk and ZK; performing the discretization to obtain animage shown in description; S3, by using the image obtained in the step S2, subjecting the pixels of the to-be-encrypted image to scrambling treatment; S4, by using the image obtained in the step S2,subjecting the scrambled image to the evolution treatment of a two-dimensional reversible cell automaton based on quadtree decomposition, repeatedly iterating and encrypting until an iteration requirement is met, and finally combining to form a ciphertext image. In this way, the problems in the prior art that ciphertext images of good hidden information effect cannot be obtained, the pixel valuesof a small ciphertext image in a secret key space is poor in distribution randomness and the correlation between adjacent pixels is high can be solved.

Description

technical field [0001] The invention belongs to image processing technology, in particular to an image encryption method based on a chaotic system and a two-dimensional reversible cellular automaton. Background technique [0002] With the rapid development of information technology and the Internet, digital images are widely used in military systems, e-commerce, telemedicine, video conferencing and financial transactions and other applications. Therefore, more and more attention has been paid to the security of digital images. In order to solve this kind of problem, it is necessary to encrypt image information. However, traditional encryption algorithms such as AES, DES, etc. are very unsatisfactory for digital images with large information, strong pixel correlation and high redundancy. Based on chaos The image encryption scheme has become a hot spot to solve the above problems. [0003] A chaotic system is a deterministic seemingly random nonlinear dynamical system. Beca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00H04L9/00
Inventor 成建宏郑少波杨玉龙朱义杰丁丹丹冯建巩杨义
Owner GUIZHOU AEROSPACE INST OF MEASURING & TESTING TECH
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