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Image encryption method

An encryption method and image technology, applied in image data processing, image data processing, instruments, etc., can solve the problems of increasing the burden and trouble of the cloud service platform, and achieve the flexibility, high efficiency, strong adaptability and security of the encryption method Effect

Pending Publication Date: 2021-02-05
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This not only brings unnecessary troubles to users, but also increases the burden on the cloud service platform

Method used

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  • Image encryption method
  • Image encryption method
  • Image encryption method

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Embodiment Construction

[0038] The present invention will be further described below in conjunction with accompanying drawing:

[0039] Such as figure 1 Shown is the encryption scheme usage figure that the present invention proposes;

[0040] The invention studies the encryption and usability of pictures stored on the cloud under the environment of cloud storage. Such as figure 1 shown. If the image is directly stored on the cloud, although the management on the cloud is convenient, the privacy of the unencrypted image is not guaranteed because the content of the unencrypted image is unobstructed; while using the traditional encryption scheme, the encrypted image is snowflake-shaped and cannot be identified The specific content of the image, which creates unnecessary troubles for the management of photos on the cloud; while the encrypted image through the thumbnail will maintain the same thumbnail as the plaintext image, which not only protects the privacy of the image, but also increases the im...

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Abstract

The invention discloses an image encryption method, which belongs to the field of image processing, and specifically comprises the following steps of: dividing an image into three channels R, G and B,dividing each channel into a plurality of B * B blocks with different sizes, and dividing the B * B blocks into pixel groups with the sizes of n; calculating the sum of all pixel values in a single block; abstracting a pixel group in a single block into n-dimensional data, reducing the n-dimensional data into n-1-dimensional data, sequentially calculating combination numbers, and adding the combination numbers to obtain a first numerical value; adding all the first numerical values to obtain subscripts of the pixel groups; encrypting the subscripts of the pixel groups; determining an encrypted pixel group according to the encrypted subscripts; and carrying out scrambling on the encrypted pixels. According to the encryption method, the whole encryption process is kept unchanged, so that the sum of pixel values in the whole large block is not changed, and the thumbnail of the ciphertext is kept consistent with the thumbnail of the plaintext.

Description

technical field [0001] The present invention relates to the field of image data encryption, in particular to a new image encryption method to ensure that the thumbnail of the ciphertext image and the thumbnail of the plaintext image are encrypted on the basis of the encrypted image. Figure 1 Sincerely. Background technique [0002] With the popularity of the Internet and various electronic devices, photos are easier to obtain in daily life, and how to store a large number of photos has become a problem that must be solved. The emergence of cloud storage technology is a good solution to this problem. People can store photos on the cloud such as cloud storage service platforms provided by Alibaba and Baidu. On the one hand, these third-party cloud service providers provide great convenience for people to store and manage photos, but on the other hand, people's privacy is not well protected. There are also numerous examples of photo data breaches. In order to deal with the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00G06F21/60
CPCG06T1/0021G06F21/602
Inventor 侯兴旺张玉书
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS