Encryption method based on iteration FrFT and chaotic single-channel color images

A color image and encryption method technology, applied in the field of virtual optical information encryption, can solve problems such as low security, small key space, and complex algorithms

Inactive Publication Date: 2014-04-09
XIAN UNIV OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to propose a single-channel color image encryption method based on iterative FrFT a

Method used

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  • Encryption method based on iteration FrFT and chaotic single-channel color images
  • Encryption method based on iteration FrFT and chaotic single-channel color images
  • Encryption method based on iteration FrFT and chaotic single-channel color images

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Embodiment Construction

[0037] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0038] The invention discloses a single-channel color image encryption method based on iterative FrFT (fractional Fourier transform) and chaos. Firstly, the color image is chaotically scrambled and decomposed into C 1 ,C 2 ,C 3 Three parts, then encrypted C 1 ,C 2 get intermediate results The amplitude C of the final encrypted intermediate result 12 and Part III C 3 Get the final ciphertext.

[0039] Specific steps are as follows:

[0040] In the first step, the color image is chaotically scrambled and decomposed into C 1 ,C 2 ,C 3 Three parts, taking the color image "Baboon.jpg" as an example, first convert the three-dimensional M×N×3 pixel "Baboon.jpg" image into a two-dimensional 3M×N pixel grayscale image, and then use pairwise logistic mapping to generate The chaotic sequence pair scrambles the grayscale image to obtain a scr...

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Abstract

An encryption method based on iteration FrFT and chaotic single-channel color images is characterized by comprising the steps that firstly the color images are placed in chaos and divided into three parts, then two parts are encrypted to obtain a middle result, and finally the amplitude of the middle result and the third part are encrypted to obtain a final cryptograph. The FrFT and the paired Logistic chaotic mapping are combined, so that the encrypted image has the nonlinearity and randomness, the safety and convergence rate of an encryption system are improved, the problem that an existing encryption method is low in convergence rate is solved, meanwhile, the complexity of the color image encryption system is reduced, the system is simple, and operation is convenient.

Description

technical field [0001] The invention belongs to the technical field of virtual optical information encryption methods, and relates to a single-channel color image encryption method based on iterative FrFT (fractional Fourier transform) and chaos. Background technique [0002] In recent years, as the problem of illegal data acquisition on the Internet has become increasingly serious, more and more researchers have turned their attention to image information security. Optical technology can efficiently process two-dimensional data in parallel, so optical encryption technology has become an important research field. In the past two decades, researchers have proposed various image information encryption systems. The double random phase encryption system proposed by Refregier and Javidi has been widely used. The double random phase system is a standard 4-f system. In this system, random phase templates are placed on the input plane and the Fourier plane respectively, so as to c...

Claims

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Application Information

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IPC IPC(8): H04N1/32H04L9/00
Inventor 隋连升段快快陈涛芦海伟
Owner XIAN UNIV OF TECH
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