具驗證能力之視覺機密分享技術

Abstract

The main functions of visual cryptography and secret sharing are distributing the secret image to several recognizable sharing images and reconstructing the secret image by overlapping the sharing images. This paper provides two methods to encrypt the secret image and authenticate whether the secret image and the sharing images are correct. Both methods of encryption decide the composition of sharing images by computing with polynomial function. And both methods of authentication use the traditional method that checks the secret image with eyes and also check the information which are hidden in the sharing images and are computed with polynomial function additionally. If the data after checked are all correct, we can identify the sharing images are valid.