Visual cryptography for image depend on RSA & AlGamal algorithms

Abstract

Visual cryptography is proposed in 1994 by Naor and Shamir who introduced a simple but perfectly secure way that allows secret sharing without any complex cryptographic computation, which they termed as Visual Cryptography Scheme. This proposal shows a new visual cryptography for color image by proposing special table for both IP and IP-1 in a way to increase the diffusion then putting the plain image into blocks each block represent share after applying encryption algorithm on it, The outcome of these operations nine shares, some of blocks encrypted by using RSA algorithm so other blocks encrypted by AlGamal algorithm, producing multiple shares in order to increase security for image during transferring it over the network. This proposed system can be used in medical imaging, financial and military fields.