A method and system for secret sharing based on visual effects

Abstract

A method and system for secret sharing based on visual effects provided by the present invention include: dividing an original image into multiple secret images; mapping each secret image into a secret block; and generating multiple shared images block by block based on the size of the secret block moving each shared image block in a cyclic stacking manner to realize the encryption of the shared image block; when decrypting, superimpose all the shared image blocks in order to obtain a decrypted image with the same quality as the original image; wherein, the secret block has multiple pixels, By encrypting the image block by block, the size of the shared image is the same as that of the secret image, which eliminates pixel expansion, improves the performance of the restored image, and realizes almost lossless visual encryption. High contrast ratio, and at the same time, the present invention does not require electronic equipment as in the traditional encryption and decryption process, and the present invention can directly print the shared image blocks on paper and arrange multiple sheets of paper vertically for decryption.

Description

technical field [0001] The invention relates to the technical field of secret image sharing, in particular to a method and system for secret sharing based on visual effects. Background technique [0002] With the development of the Internet and smart devices, there is an urgent need to access information anytime, anywhere. Public networks usually have an open connection and untrusted communication channel. Traditional cryptography can ensure the security and privacy of information. However, storing, managing, and distributing keys is a lot of work. [0003] In 1994, Naor and Shamir [1] proposed a visual cryptography scheme, Visual Cryptography Scheme (VCS), which aims to encrypt secret code information into multiple shares and transmit it to users through untrusted communication channels. While the human eye can easily reveal a secret image or message by stacking a sufficient number of shares. The threshold scheme of Naor and Shamir divides the secret black and white ima...

AI Technical Summary

Problems solved by technology

We can also use probabilistic methods to keep the image size constant, but these schemes also reduce the contrast with existing VCS, thus resulting in a lower visual quality of the restored image

The new model proposed by Shamir [1] improves the contrast with a multi-layer cover base, but the problem of pixel dilation still exists

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