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Single-channel color image encryption method based on vector decomposition and phase encoding

A color image and phase encoding technology, which is applied in the fields of information security and optical information processing, can solve the problems of not being able to encrypt color images, reducing the key space, and inconvenient updating of random phase masks

Active Publication Date: 2019-04-05
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 methods have the following disadvantages and deficiencies: (1) When the image to be encrypted is a real-valued amplitude image, the first random phase mask located at the input plane cannot be encrypted. key, which greatly reduces the key space of this type of encryption system; (2) the random phase mask is used as the master key in the process of encryption and decryption, and it is inconvenient to manage and transmit the random phase mask key; (3) due to random The phase mask is inconvenient to update, so the encryption system is vulnerable to chosen plaintext attack and known plaintext attack; (4) Most of these encryption systems are designed for grayscale or binary images, and cannot be directly used to encrypt color images

Method used

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  • Single-channel color image encryption method based on vector decomposition and phase encoding

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Embodiment 1

[0086] A single-channel color image encryption method based on vector decomposition and three-dimensional chaotic double-random phase encoding. The schematic diagram of its encryption and decryption principle is shown in figure 1 shown. The method consists of an encrypted part of the image and a decrypted part.

[0087] (1) The encrypted part of the image:

[0088] The image encryption part: the color image to be encrypted is first decomposed into three color channels of R, G, and B; then, after the three color channels are subjected to Arnold transformation, their phase encoding is used as a unit vector, and the two channels of R and G are The vectors of the channels are added and synthesized into a vector, and the synthesized vector V is recorded 1 Amplitude A 1 and phase phase key As an auxiliary key of the encryption system; next, combine the B color channel unit vector with the vector V synthesized in the previous step 1 Adding to get the composite vector V of the...

Embodiment 2

[0093] Combine below figure 1 The design principle introduces the scheme in embodiment 1 in detail, see the following description for details:

[0094] A single-channel color image encryption method based on vector decomposition and three-dimensional chaotic double-random phase encoding. The schematic diagram of its encryption and decryption principle is shown in 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.

[0095] (1) The encrypted part of the image:

[0096] 1) First decompose the color image f to be encrypted into three RGB color channels f R , f G and f B ; Then, carry out Arnold transformation on it respectively, and pass the transformed three color channels through the spatial light modulator SLM respectively 1 、SLM 2 and SLM 3 Encode the three color channels into a phase form f′ j :

[0097] f' j =exp(i·ART(f j )) (1)

...

Embodiment 3

[0128] 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:

[0129] 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 color image is successfully encrypted by this system.

[0130] 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 certain key...

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Abstract

The invention relates to the technical field of information security and optical information processing, and aims to greatly reduce the complexity of an encryption system. The security of the system is improved, and common cryptography attacks can be effectively resisted. Therefore, the single-channel color image encryption method based on vector decomposition and phase encoding comprises the following steps: (1) an image encryption part: firstly decomposing a color image to be encrypted into three color channels, namely red R, green G and blue B; Carrying out first three-dimensional chaotic random phase mask modulation on the synthesized grayscale image, carrying out first Gyrator transformation on the modulated image, and then carrying out second Gyrator transformation on the modulated image, so that the transformed image is a final encrypted image; And (2) an image decryption part: firstly, carrying out inverse transformation of Gyrator transformation for the second time on the encrypted image, and integrating the three color channels together to obtain a decrypted color image. The method is mainly applied to an optical information encryption and decryption processing occasion.

Description

technical field [0001] The invention relates to the technical fields of information security and optical information processing, in particular to a single-channel color image encryption method based on vector decomposition and three-dimensional 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F21/60
CPCG06F21/602G06F2221/2107
Inventor 唐晨陈明明李碧原
Owner TIANJIN UNIV
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