VISUAL CRYPTOGRAPHY SCHEME BASED ON PIXEL EXPANSION FOR BLACK & WHITE IMAGE
Lekhika Chettri · 2014
This paper explains the 2 out of 2 visual cryptography schemes based on pixel expansion m=2 in detail. Visual cryptography enables the secure transmission of images in open and insecure media. The scheme explained in this paper is based on k out of k visual cryptography scheme. To prevent the discloser of the secret by forming copy of the first share randomization of sub pixel is performed on the shares. One single share cannot disclose the secret. To extract the secret message both the shares are needed to superimpose one on another. We provide (2, 2) Visual Cryptography (VC) in detail for black and white image based on pixel expansion scheme.