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

A modulo inverse operation, digital image technology, applied in the field of image encryption and image decryption, can solve the problems of inability to have both encryption effects and small storage space, and achieve simple and efficient recovery methods, simple operations, and simple and easy classification methods. Effect

Inactive Publication Date: 2022-03-08
李小平
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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 inverse operation
  • Digital image encryption method and image decryption method based on modular inverse operation
  • Digital image encryption method and image decryption method based on modular inverse 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 inverse operation, which includes: given an original image A; the pixel point in A in row i and column j is expressed as p i,j , classify all pixels whose value of i+j is an odd number into the first category, and classify all pixels whose value of i+j is an even number into the second category; Modular inverse operation, replace the original pixel value with the obtained modulus inverse value, obtain the encrypted image A'; carry out modulus to the pixel points of the first class or the second class in A described in claim 1 in A' The pixel points obtained by the inverse operation are then subjected to a modular inverse operation; the original image A can be recovered by replacing the obtained modular inverse value with the original pixel value. The method for classifying image pixels in the present invention is simple and easy, the encryption operation for pixels is simple, no additional information is needed in the whole encryption and recovery process, the image information transmission efficiency is high, and individual pixel errors will not cause errors Diffusion phenomenon.

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 Patents(China)
IPC IPC(8): H04N19/65H04N19/467
CPCH04N19/65H04N19/467
Inventor 李小平
Owner 李小平
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