A Probabilistic Model of Visual Cryptography Using Halftoned Technique for Color Image

Visual Cryptography is a special type of encryption technique which is used to hide the information and data in images. In this technique the decryption process is done without any complex cryptographic computation. The encrypted data is decrypted using Human Visual System (HVS). This is the benefit of the visual secret sharing scheme. The encryption technique requires a cryptographic computation to divide the image into a number of parts or we can call it shares. We divide the image into n number of shares. In this paper we proposed a new secret sharing VC scheme for taking two images one is black and white image with size of 127x261 and other is color image with size of 196x92.In contrast with the previous color visual cryptography schemes, the proposed one enables to share images without pixel expansion and to detect a forgery as the color of the message is kept secret. In order to correctly print the colors on the media and to increase the security of the scheme, we use spectral models developed for color reproduction describing printed colors from an optical point of view.