Image encryption method and device, electronic equipment and readable storage medium

An image, to-be-encrypted technology, applied in encryption devices with shift registers/memory, image communication, secure communication devices, etc., can solve the problems of quality degradation of pseudo-random sequences, sacrificing speed, large amount of calculation for replacement and diffusion, etc.

Active Publication Date: 2020-03-24
ZHUHAI DAHENGQIN TECH DEV CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The precision of the chaotic function in practical application is not infinite, and the limited precision will bring two important problems: 1. The quality of the pseudo-random sequence generated by the chaotic system is reduced; 2. Limiting the key space...

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  • Image encryption method and device, electronic equipment and readable storage medium
  • Image encryption method and device, electronic equipment and readable storage medium
  • Image encryption method and device, electronic equipment and readable storage medium

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Embodiment Construction

[0070] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0071] refer to figure 1 and figure 2 , figure 1 It is a flow chart of the steps of an image encryption method based on a parallel hybrid chaotic system in a precision-limited mode in an embodiment of the present invention, figure 2 is a schematic structural diagram of a parallel hybrid chaotic system in a precision-limited mode in an embodiment of the present invention, as shown in figure 1 and figure 2 As shown, the parallel hybrid chaotic sys...

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Abstract

The invention provides an image encryption method and device, electronic equipment and a readable storage medium. The method comprises following steps of acquiring a first pseudo-random sequence and asecond pseudo-random sequence with preset lengths by connecting a hybrid chaotic system in parallel in a precision limited mode; processing the first pseudo-random sequence with the preset length toobtain a first permutation matrix and a first diffusion matrix; according to the first permutation matrix, replacing the to-be-encrypted image by a square formed by four adjacent pixel points as a unit to obtain a first image after replacement; and performing row diffusion and column diffusion on the replaced first image according to a first diffusion matrix to obtain an intermediate result image,and performing a second round of replacement and diffusion on the intermediate result image through the same method to obtain an encrypted image. With the method, the secret key space is increased, the operation speed is increased, higher safety is achieved, and the calculated amount during replacement and diffusion can be reduced.

Description

technical field [0001] The invention relates to the technical field of image encryption, in particular to an image encryption method, device, electronic equipment and readable storage medium. Background technique [0002] With the rapid development of multimedia services, more and more videos and pictures are generated on the network. Compared with text, pictures and videos contain richer information and are more prone to privacy leakage. Therefore, there have been more and more researches on image encryption in recent years. There is a strong correlation between adjacent pixels of an image, so traditional encryption algorithms such as RSA, DES, and AES are not suitable for image encryption. In recent years, more and more image encryption algorithms based on chaos theory have been proposed. Chaotic systems have many properties suitable for image encryption, such as initial value sensitivity, unpredictability and ergodicity. [0003] Permutation-Diffusion Network (PDN) is...

Claims

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Application Information

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IPC IPC(8): H04L9/00H04L9/06H04N1/44
CPCH04L9/001H04L9/0662H04N1/44
Inventor 邓练兵李皓
Owner ZHUHAI DAHENGQIN TECH DEV CO LTD
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