A random Grid-based Visual Cryptography to Adjust Light Transmission and the Number of Shares

Abstract

Visual cryptography is a way that can decrypt the secret image by the human’s eye rather than decrypt by the computer. Visual cryptography encrypts a secret image into many shares. We can’t recognize the secret image from a share because the shares are chosen randomly. When the shares are superimposed together, we can recognize the secret image by human’s vision. In the process, we don’t need complicatedly calculate by means of the computer. This research applies the concept of random grids. We propose many different algorithms according to difference number of the shares and difference light transmission of the share. In which, every shares were produced that can’t be figured out any information about the secrete image, but it will be identified the when all the shares are superimposed.