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Method and system for grading and sharing authority and reconstructing secret image
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A technology for secret images and images, applied in the field of hierarchical sharing of rights and reconstructing secret images, can solve the problems of large shadow image size, low visual quality of reconstructed images, inconsistent shadow image sizes, etc., and achieves simple recovery process, reconstruction recovery Efficient effect
Pending Publication Date: 2022-04-29
SHENZHEN INST OF ADVANCED TECH +1
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[0005] This application provides a method and system for sharing and reconstructing a secret image based on authority classification, so as to solve the problem in the prior art that the reconstruction of the secret image using a construction scheme based on visual cryptography will lead to a large size of the shadow image and the reconstruction of the image The visual quality is low; and using a polynomial-based construction scheme to reconstruct the secret image will lead to inconsistent shadow image sizes, splicing of sub-shadow images, and high complexity in the decryption process
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Embodiment 1
[0088] like figure 1 As shown, Embodiment 1 of the present application provides a method for sharing and reconstructing a secret image with hierarchical permissions, including the following steps:
[0089] S101. Acquire a secret image, and set related parameters of the secret image according to the permission-level image secret sharing method; the related parameters include a first parameter, a second parameter, and a third parameter, and 1≤the first parameter
[0090] S102. According to the Chinese remainder theorem, share the secret image to obtain a shadow image; the number of the shadow images is equal to the third parameter, the shadow image includes a core shadow image and a non-core shadow image, and the core The number of shadow images is equal to the first parameter, and the number of non-core shadow images is equal to the difference between the third parameter and the first parameter;
[0091] S103. Select the core shadow imag...
Embodiment 2
[0129] Corresponding to the foregoing embodiment 1 of a method for sharing and reconstructing a secret image by authority hierarchy, the present application also provides embodiment 2 of a system for sharing and reconstructing a secret image by authority hierarchy. The system includes: interconnected acquisition unit, sharing unit and reconstruction unit,
[0130] Wherein, the acquisition unit is configured as:
[0131] Obtain a secret image, and set the relevant parameters of the secret image according to the secret sharing method of hierarchical images; the relevant parameters include the first parameter, the second parameter and the third parameter, and 1≤the first parameter
[0132] The shared unit is configured as:
[0133] According to the Chinese remainder theorem method, the secret image is shared to obtain a shadow image; the number of the shadow image is equal to the third parameter, the shadow image inclu...
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Abstract
The invention provides a method and system for grading and sharing authority and reconstructing a secret image, and the method comprises the steps: obtaining a secret image, and setting the related parameters of the secret image according to an authority grading image secret sharing method; according to a Chinese remainder theorem method, sharing the secret image to obtain a shadow image, the shadow image including a core shadow image and a non-core shadow image; the core shadow sub-images and the non-core shadow sub-images meeting the preset number are selected to be reconstructed, and a secret image can be reconstructed; the preset number is not smaller than the second parameter, and the number of core shadow images contained in the preset number is equal to the first parameter. The core shadow image and the non-core shadow image are obtained through the authority grading secret image sharing method based on the Chinese remainder theorem, and the secret image sharing process is safer; through the core shadow image and the non-core shadow image meeting certain reconstruction conditions, the original secret image can be reconstructed in a lossless manner, and the recovery process of the original secret image is simpler.
Description
technical field [0001] The present application relates to the technical field of image security protection, and in particular to a method and system for sharing and reconstructing secret images with hierarchical permissions. Background technique [0002] Traditional image security protection technologies mainly include image encryption technology and information hiding technology, and image secret sharing (ISS) is an important branch of information hiding technology. Image secret sharing means that a secret image is hidden in two or more shadow images through an algorithm, and any information of the secret image cannot be obtained through a single shadow image, and the secret image can only be recovered by combining shadow images that meet certain conditions. Secret image. However, the shadow images of most image secret sharing schemes have the same importance or decryption authority, and the secret image cannot be recovered losslessly according to the authority of the shad...
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Application Information
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