(k,n) threshold based user-friendly visual secret sharing method
A secret sharing and threshold technology, applied in the field of information security, can solve problems such as low security, inconvenient management, and damage to image integrity, and achieve the effects of improving contrast, improving visual effects, and increasing the scope of image application.
Active Publication Date: 2016-03-16
XIDIAN UNIV
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However, there are some defects in this method: first, the contrast ratio of this method is very low
Due to the random acquisition of n-k pixels in this method, the contrast after superimposing the image is particularly low
Second, the security of this method is particularly low. Randomly generated random grids are meaningless and inconvenient to manage. This can easily attract the attention of malicious attackers during transmission and storage, thus destroying the integrity of the image, resulting in The secret image cannot be recovered, and sometimes the shared share will be stolen, resulting in the leakage of the secret image
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[0036] The specific embodiments of the present invention will be described below in conjunction with the accompanying drawings.
[0037] refer to figure 1 , the implementation steps of the present invention are as follows:
[0038] Step 1, input a secret image S and n cover images C to be protected.
[0039] The secret image S is an image that needs to be protected, and the cover image C is used to hide the secret image S. The size of the cover image and the secret graphic must be equal, here it is set to r×c, r represents the height of the secret image and the cover image, and c represents the secret image and The width of the cover image.
[0040] Step 2, use the traditional random grid-based method to generate a shared image, the secret image S uses a binary image, for the traditional random grid-based visual secret sharing method, firstly, the pixel S of the secret image S i,j For coding, the following first introduces the traditional random grid.
[0041] 2a) Generate...
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The invention discloses a (k,n) threshold based user-friendly visual secret sharing method and mainly solves the problems of low security and contrast in the prior art. The method is implemented by the steps of 1, performing (k,n) random grid processing on a binary secret image S to obtain n basic shared images of random grids; 2, performing block segmentation on an input gray cover image by using histogram equalization to obtain a gray level equivalent to the gray level of each small image block; 3, performing halftone processing on the cover image subjected to the block segmentation, and according to a generated dithering matrix, obtaining a shared cover image after the halftone processing; and 4, performing block segmentation on the generated basic shared images and cover image, performing combination according to a stacking ratio of a constant value delta, and performing block segmentation and combination to generate a meaningful final shared image. According to the method, the attack of attackers can be prevented, the meaningful final shared image can be generated, and the application range of visual secret sharing can be extended.
Description
technical field [0001] The present invention relates to the technical field of information security, and is a visual secret sharing method for information hiding, a user-friendly visual secret sharing method called (k, n) threshold, which can be used for image protection, image sharing, and real-time transmission of images Wait. Background technique [0002] In 1979, Blakley and Shamir respectively proposed the concept of secret sharing. The secret sharing method is to divide the secret into different shares, and any share greater than or equal to a certain number can recover the secret, and vice versa. Due to the widespread use of images in daily life, in 1995, Naor and Shamir introduced the secret sharing method into the field of image processing, and proposed the first visual secret image sharing method. The visual secret sharing method divides the secret image into different shares, and any share greater than or equal to a certain number can recover the secret image, a...
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CPCG06F21/602
Inventor 庞辽军苗得雨
Owner XIDIAN UNIV