Security of digital information plays important role to keep the integrity of original media. A secret is something which is kept away from the knowledge of any but those who are privileged to access it. Secret sharing scheme provides a mechanism for sharing secrets among different users securely, where each user receives his part of encoded secret information called as a share. Sufficient number of shares need to be combined together to reconstruct secret information. Text, images, audio and video can be used for sharing secret information in secret sharing scheme. Secret sharing scheme in which secret information is encoded in form of concealed images is called as Visual Cryptography. There are various Visual Cryptography Schemes. Visual Cryptography Scheme’s functionality is dependent on their basis matrices. Constructions of basis matrices for various OR-based and XOR-based Visual Cryptography Schemes are elaborated in this paper.

Secret sharing scheme, Visual Cryptography, Data hiding

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