Double-image encryption method based on chaotic and discrete fraction random transform

An encryption method and double image technology, applied in the field of virtual optical information encryption, can solve the problems of easy attack and low security of linear systems

Active Publication Date: 2014-07-30
BEIJING YINGPU TECH CO LTD
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Problems solved by technology

[0006] The purpose of the present invention is to propose a double-image encryption method based on chaos and discre...

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  • Double-image encryption method based on chaotic and discrete fraction random transform
  • Double-image encryption method based on chaotic and discrete fraction random transform
  • Double-image encryption method based on chaotic and discrete fraction random transform

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Embodiment Construction

[0074] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0075] The double-image encryption method based on chaos and discrete fraction random transformation comprises image expansion step, chaos scrambling step, chaotic diffusion step, image contraction step, image reorganization step and discrete fraction random transformation step; specifically as follows:

[0076] The first step: image expansion; there are two original grayscale images I 1 and I 2 , the size of the two images is N×N, the I i (i=1,2) is decomposed into two sub-images I' i and I" i (i=1,2), the obtained four sub-images form a 2N×2N extended image I e ,Specifically:

[0077] First, two N×N original grayscale images I i (i=1,2) 1, 3, 5, and 7 bit planes are taken out to form the sub-image I' i 1, 2, 3, and 4 planes of (i=1, 2), the rest of the planes are set to 0, and I i (i=1,2) 2,4,6,8 bit planes are taken out to form sub...

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Abstract

A double-image encryption method based on chaotic and discrete fraction random transform comprises the steps of image expansion, chaotic scrambling, chaotic diffusion, image contraction, image reconstruction and discrete fraction random transform. According to the method, an expanded image is formed by a gray level image I1 and a gray level image I2 through the expansion step, the pixel positions and pixel intensity values are changed through the scrambling and diffusion process based on Logistic chaotic mapping, and then the expanded image is decomposed into a new image J1 and a new image J2 which are stable in white noise distribution through a contraction strategy; the image J2 is normalized and encrypted so as to form a pure phase matrix and a complex matrix J is obtained by multiplying the pure phase matrix and the image J1; finally, the complex matrix encrypted so as to form a temporary image through discrete fraction random transform based on Logistic chaos and the amplitude part is a final ciphertext image. Nonlinearity and randomness of a plaintext image in a spatial domain and a transform domain are enhanced, common attacks can be well resisted, and safety of an encryption system is improved.

Description

technical field [0001] The invention belongs to the technical field of virtual optical information encryption methods, and relates to a double-image encryption method based on random transformation of chaos and discrete fractions. Background technique [0002] As the illegal data access in the Internet becomes more and more serious, the issue of information security has been widely concerned. Optical image encryption has grown into an important field due to its high-speed parallelism in processing two-dimensional data. [0003] Since Refregier and Javidi proposed an optical image encryption algorithm based on double random encryption of input plane and output plane, researchers have proposed various optical encryption and authentication systems. According to its scope, it can be divided into Fourier domain, Fresnel domain, gyrator transform domain and fractional Fourier domain. In addition, the chaotic system is also introduced into the image security system due to its erg...

Claims

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Application Information

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IPC IPC(8): G06T1/00
Inventor 隋连升刘本庆芦海伟段快快
Owner BEIJING YINGPU TECH CO LTD
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