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Digital image encryption method and image decryption method based on modular inversion operation

A technology of modular inverse operation and digital image, which is applied in the field of image encryption method and image decryption, can solve the problems of small storage space and encryption effect can not be achieved at the same time, and achieve simple operation, simple and efficient recovery method, and simple and easy classification method Effect

Active Publication Date: 2020-04-03
李小平
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  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide an image encryption method and an image decryption method in order to solve the contradiction that a smaller storage space and a good encryption effect cannot be achieved at the same time

Method used

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  • Digital image encryption method and image decryption method based on modular inversion operation
  • Digital image encryption method and image decryption method based on modular inversion operation
  • Digital image encryption method and image decryption method based on modular inversion operation

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Embodiment Construction

[0025] Specific embodiments of the present disclosure will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present disclosure, and are not intended to limit the present disclosure.

[0026] Such as figure 1 As shown, the digital image encryption method based on the modular inverse operation comprises the following steps:

[0027] (1) Given the original image A;

[0028] (2) The pixel at row i and column j in A is denoted as p i,j , classify all pixels whose values ​​of i+j are odd numbers into the first category, and classify all pixels whose values ​​of i+j are even numbers into the second category;

[0029] (3) Perform a modular inverse operation on all pixels of the first or second category, replace the original pixel values ​​with the obtained modular inverse value, and obtain the encrypted image A'.

[0030] Pixel point p in S3 ...

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Abstract

The invention discloses a digital image encryption method based on modular inversion operation. The method comprises the following steps: giving an original image A, wherein the pixel point located atthe ith row and the jth column in the A are expressed as pi, j, all the pixel points with the value of i + j being an odd number are classified into a first type, and all the pixel points with the value of i + j being an even number are classified into a second type; performing modular inversion operation on all the pixel points of the first type or the second type, and replacing the original pixel value with the obtained modular inversion value to obtain an encrypted image A'; performing modular inversion operation on the pixel points obtained by performing modular inversion operation on thepixel points of the first type or the second type in the A according to the claim 1 in the A'; and replacing the original pixel value with the obtained modular inversion value to recover the originalimage A. The method for classifying the pixel points of the image is simple and easy to implement, the encryption operation of the pixel points is simple, extra information is not needed in the wholeencryption and recovery process, the image information transmission efficiency is high, and errors of individual pixel points cannot cause the diffusion phenomenon of errors.

Description

technical field [0001] The invention relates to the technical field of encryption and restoration in image processing, in particular to an image encryption method and an image decryption method. Background technique [0002] The rapid development of information technology has brought great convenience to people's life on the one hand, and on the other hand, the problems caused by information leakage or tampering during transmission have threatened the security of information to a certain extent. As one of the main carriers of information transmission, digital images are inevitably attacked illegally. How to efficiently transmit digital images and avoid information leakage has always been one of the important research contents in the field of information security. [0003] Different from the encryption of text, voice and other media, the encryption of digital images has its unique characteristics: first, digital images themselves contain a large amount of data, so their encr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/65H04N19/467
CPCH04N19/65H04N19/467
Inventor 李小平
Owner 李小平
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