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Fourier transform and chaotic double-random phase encoding color image encryption method

A chaotic random phase and Fourier transform technology, applied in the fields of information security and optical information processing, can solve the problems of reducing the key space of the encryption system, inconvenient key management and transmission, unable to encrypt color images, etc. Transmission difficulty, resistance to cryptographic attacks, and the effect of increasing key space

Inactive Publication Date: 2019-01-04
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most image encryption systems based on double random phase encoding method have the following disadvantages and deficiencies: (1) When the image to be encrypted is a real-valued amplitude image, the first random phase plate located at the input plane cannot be used as a key , which greatly reduces the key space of this type of encryption system; (2) The random phase plate is used as the master key in the encryption and decryption process, which is inconvenient for the management and transmission of the random phase plate key; (3) Most of these encryption systems It is designed for grayscale or binary images and cannot be directly used to encrypt color images

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  • Fourier transform and chaotic double-random phase encoding color image encryption method
  • Fourier transform and chaotic double-random phase encoding color image encryption method
  • Fourier transform and chaotic double-random phase encoding color image encryption method

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Embodiment 1

[0070] A phase-only color image encryption method based on Fourier transform and chaotic double-random phase encoding, the schematic diagram of its encryption and decryption principle is as follows figure 1 shown. The method consists of an encrypted part of the image and a decrypted part.

[0071] (1) The encrypted part of the image:

[0072] In the encryption process, the color image to be encrypted is firstly decomposed into three color channels of R, G, and B; then, these three color channels are respectively encoded into a pure phase form; next, the three color channels of a pure phase form are respectively It is modulated by the first chaotic random phase plate, and then Fourier transform is performed on the three modulated color channels; finally, the three color channels after Fourier transform are respectively modulated by the second chaotic random phase plate , and then inverse Fourier transform is performed on the modulated three color channels, and the three trans...

Embodiment 2

[0077] Combine below figure 1 The design principle introduces the scheme in embodiment 1 in detail, see the following description for details:

[0078] A phase-only color image encryption method based on Fourier transform and chaotic double-random phase encoding, the schematic diagram of its encryption and decryption principle is as follows figure 1 shown. The method consists of an encrypted part of the image and a decrypted part. The specific implementation manners of these two parts will be described in detail below.

[0079] (1) The encrypted part of the image:

[0080] 1) First decompose the color image f to be encrypted into three RGB color channels f R , f G and f B ; Then, encode the three color channels into a phase-only form f′ j :

[0081] f' j =exp(iπf j ) (1)

[0082] In the formula, j=R, G, B; i is the imaginary number unit; π is the circumference ratio.

[0083] 2) The three color channels in pure phase form are multiplied by the first chaotic random ...

Embodiment 3

[0104] Below in conjunction with specific accompanying drawing, the scheme in embodiment 1 and 2 is carried out feasibility verification, see the following description for details:

[0105] The image encryption method provided by the implementation of the present invention can convert a color image (such as figure 2 Shown in (a)) encrypted into a noise-like image (such as figure 2 (b) shown). Depend on figure 2 (b) It can be seen that the information of the original color image is hidden in the noise-like image, which shows that the encryption of the color image by this system is successful.

[0106] The image encryption method provided by the implementation of the present invention is used to restore the original color image from the encrypted image. When all keys are correct, the result obtained is as follows: figure 2 (c) shown. Depend on figure 2 (c) It can be seen that the original image can be fully restored when all keys are correct. In addition, when a certa...

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Abstract

The invention relates to the technical field of information security and optical information processing and aims to provide a new image encryption method and realize pure phase encryption of a color image, the method has a large key space and high security, and the invention concretely relates to a Fourier transform and chaotic double-random phase encoding color image encryption method. The invention comprises an image encryption part including the steps of modulating color channels of a color to be encrypted in pure phase forms with a first chaotic random phase plate and then performing Fourier transform on the modulated three color channels to be integrated to be a final color encryption image, and (2) an image decryption part including the steps of performing Fourier transform on the three color channels, modulating the three transformed color channels separately by using a second chaotic random phase plate, and integrating the three modulated color channels to be a decrypted colorimage. The method is mainly applied to information security and optical information processing occasions.

Description

technical field [0001] The invention relates to the technical fields of information security and optical information processing, in particular to a phase-only color image encryption method based on Fourier transform and chaotic double-random phase encoding. Background technique [0002] As one of the most popular multimedia forms at present, digital images are widely used in the fields of politics, economy, military affairs, education and so on. In today's highly developed Internet technology, how to protect digital images from tampering, illegal copying and dissemination has important practical significance. The research on image encryption technology has become one of the research hotspots in the field of information security. [0003] Due to the advantages of optical information processing technology, such as high processing speed, high parallelism, and fast implementation of convolution and correlation operations, digital image encryption using optical methods has arous...

Claims

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Application Information

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IPC IPC(8): H04N1/44H04L9/00H04L9/08
CPCH04N1/44H04L9/001H04L9/0869
Inventor 唐晨杨冬梅苏永钢
Owner TIANJIN UNIV
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