Enhancement of security in visual cryptography system using cover image share embedded security algorithm (CISEA)

Visual Cryptography is an encryption technique used to hide visual information in such a way that it can be decrypted by the human visual system, without using any decryption algorithm. There exist various schemes like digital watermarking algorithm etc. In this paper we have proposed a new algorithm to enhance the security in visual cryptography. To achieve this level of security, we have proposed a Cover Image Share Embedded security algorithm (CISEA) to produce the meaningful shares from the secret image. In this algorithm we have applied a new concept for generation of compliment images of a cover image over which the shares of secret image are to be embedded. CISEA provides one more layer of security for the images in communication channel. It is shown that CISEA provides better security compared to security provided by visual cryptography using digital watermarking system and the results are tested using MS visual studio dot net platform.