Security of information hiding becomes important in a number of application areas of today's world. Audio, video, pictures are increasingly furnished with distinguishing but imperceptible marks, which may contain a hidden copyright notice or several number or even help to prevent unauthorized copying directly. Visual Cryptography Scheme (VCS) is a cryptographic technique in which visual information(e.g. printed text, pictures etc.) encrypted by generating shares (transparencies) of a binary secret image into meaningless shadow images, where decryption can be performed by a human visual system without any computational cost.