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Asymmetric double-image encryption method based on fractional Fourier domain phase recovery procedure

A fractional Fourier and Fourier domain technology, applied in the field of asymmetric double image encryption, can solve the problems of being vulnerable to attacks and low security, and achieve the effects of convenient operation, improved security, and improved convergence speed

Inactive Publication Date: 2014-07-30
XIAN UNIV OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to propose an asymmetric double-image encryption method based on the phase recovery process in the fractional Fourier domain to solve the problems of low security and vulnerability to attacks in the prior art

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  • Asymmetric double-image encryption method based on fractional Fourier domain phase recovery procedure
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  • Asymmetric double-image encryption method based on fractional Fourier domain phase recovery procedure

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Embodiment Construction

[0040] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0041] An asymmetric dual-image encryption method based on the phase recovery process in the fractional Fourier domain, including pure phase extraction, phase modulation, and fractional Fourier transform; the specific steps are as follows:

[0042] The first step, pure phase extraction: there are two original grayscale images, use the fractional Fourier domain phase recovery process to extract the i (i=1,2) grayscale image f i The pure phase function ξ of (i=1,2) i,1 (i=1,2); extract the original grayscale image f using the fractional Fourier domain phase recovery process i (i=1,2) in the process of pure phase function, the accompanying phase template function φ i,1 ,φ i,2 ,ξ i,2 (i=1,2);

[0043] The second step, phase modulation: in the temporary image generation module, a complex matrix H i (i=1,2) through the amplitude image g and t...

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Abstract

An asymmetric double-image encryption method based on a fractional Fourier domain phase recovery procedure comprises the steps of pure phase extraction, phase modulation and fractional Fourier transform. The asymmetric double-image encryption method based on the fractional Fourier domain phase recovery procedure is applied to double-image encryption, the encryption process is different from the decryption process, an encryption key is different from a decryption key, and the defects that a traditional symmetric encryption algorithm is easy to attack and an encryption key is the same as a decryption key are overcome. Through attack tests, it is proved that the method is high in resistance to violent attacks, noise attacks and other specific attacks. Meanwhile, key space is large, the problem that a traditional encryption algorithm is insufficient in key space is solved, the decryption process can be realized through an optical method, and a system is simple and convenient to operate.

Description

technical field [0001] The invention belongs to the technical field of virtual optical information encryption methods, and relates to an asymmetric double-image encryption method based on a fractional Fourier domain phase recovery process. Background technique [0002] With the rapid popularization of the Internet, images, as a very efficient information carrier in contemporary society, have been widely used in various fields, and image encryption has become an important field in the field of information security. Since Refregier and Javidi proposed the classic double random phase encryption (DRPE) technology, in the past ten years, many encryption and authentication based on Fourier transform domain, fractional Fourier transform domain, Fresnel domain, GT domain systems have been proposed. Moreover, Alfalou and Brosseau point out: these techniques can also be used as compression operations. Although most of the published DRPE-based optical encryption systems have excellen...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
Inventor 隋连升刘本庆芦海伟段快快
Owner XIAN UNIV OF TECH
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