Secret sharing schemes allows information to be shared among a group of participants so that all together (or qualified subsets) of participants can recover the information. A visual cryptography scheme (VCS) is a cryptographic technique which allows visual information (e. g. printed text, handwritten notes, and picture) to be encrypted in such a way that the decryption can be performed by the human visual system, without the aid of computers. The performance of any visual cryptography scheme depends on various measures such as pixel expansion, contrast, security, accuracy, computational complexity etc. This work throws light on the theoretical background and the comparison on the various visual cryptography schemes. Here introduces a 2 in 1 scheme which can embed additional information with reduced shadow size and better visual quality of revealed image. Compared with the two-in-one image secret sharing scheme (TiOISSS), this scheme might achieve smaller shadow size with acceptable visual quality. The paper discusses Sharing More Information Gray Visual Cryptography Scheme (SMIGVCS) which can embed additional information with reduced shadow size and better visual quality of revealed image. The main results of this paper include implementation of a visual cryptographic scheme with a reduced share size.

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Bit Level Decomposition Polynomial Based Image Secret Sharing Scalability Shadow Size Visual Cryptography.