Multi-image encryption method based on chaos and FrFT domain phase retrieval process

A phase recovery and encryption method technology, applied in the field of virtual optical information encryption, can solve the problems of small key space, slow convergence speed, and low security

Inactive Publication Date: 2014-07-02
XIAN UNIV OF TECH
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Problems solved by technology

[0006] The purpose of the present invention is to propose a multi-image encryption method based on chaos and FrFT domain

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  • Multi-image encryption method based on chaos and FrFT domain phase retrieval process
  • Multi-image encryption method based on chaos and FrFT domain phase retrieval process
  • Multi-image encryption method based on chaos and FrFT domain phase retrieval process

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Embodiment Construction

[0068] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0069] The invention proposes a multi-image encryption method based on chaos and FrFT domain phase recovery process, which includes a chaos scrambling step, a pure phase extraction step, a phase modulation step, and a chaos diffusion step. Specific steps are as follows:

[0070] The first step: chaos chaos. With 9 grayscale images of 256×256 pixels f i (i=1,2,...,9) as an example, use the paired logistic map to scramble it to get the scrambled image f i '(i=1,2,...,9).

[0071] The second step: pure phase extraction, for each scrambled image f i '(i=1,2,...,P) implement an iterative phase recovery process to extract its pure phase function

[0072] The third step: phase modulation, the P original grayscale images f i Pure phase function of (i=1,2,...P) The modulation is a complex matrix G with a size of M×N, and the series of the c...

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Abstract

A multi-image encryption method based on the chaos and FrFT domain phase retrieval process includes the chaos scrambling step, the pure phase extraction step, the phase modulation step and the chaos diffusion step. The method includes the steps of firstly, scrambling multiple original gray level images to be encrypted through paired logistic mapping to obtain scrambled images; secondly, conducting the iterated phase retrieval process on each scrambled image to extract a pure phase function of the scrambled image; thirdly, conducting phase modulation on the pure phase functions on the multiple original gray level images to be encrypted; fourthly, conducting chaos diffusion on the amplitudes of the results obtained through modulation to obtain the final cipher text. According to the multi-image encryption method, nonlinearity and randomness of plaintext images in the spatial domain and the conversion domain are enhanced, the convergence speed of an encryption system is increased, and security of the encryption system is enhanced.

Description

technical field [0001] The invention belongs to the technical field of virtual optical information encryption methods, and relates to a multi-image encryption method based on chaos and FrFT (fractional Fourier transform) domain phase recovery process. Background technique [0002] With the rapid popularization of computers and the Internet, the exchange of information plays an important role in modern society. As an effective carrier of information, images are widely used in various fields. The acquisition, transmission, and processing of image data cover every corner of the digital age, and security issues are becoming more and more serious. So far, image security issues have been widely concerned. [0003] Since Refregier and Javidi proposed an optical image encryption algorithm based on random encryption of the input plane and the output plane, researchers have proposed many algorithms based on other domains (such as fractional Fourier domain, gyrator transform domain, ...

Claims

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Application Information

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IPC IPC(8): G06T1/00
Inventor 隋连升段快快陈涛芦海伟
Owner XIAN UNIV OF TECH
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