A Survey of Various Visual Cryptography Techniques

International Journal of Computer Science (IJCS) Published by SK Research Group of Companies (SKRGC)

Abstract

Visual cryptography is a entirely secure method to save from harm secrets and is differentiated by its original decryption process. A visual cryptography method is a process to divide a secret image into a set of shares so that a number of authorized shares can right of entry to the secret while other unauthorized shares cannot reveal out any secret information. In recent times, visual cryptography or its perception is fundamentally assumed to protect the rational possessions rights for digital images. On the other hand, some of the schemes do not assure the security conditions of visual cryptography; thus they cannot be used to protect the copyright of the images. Additionally, many techniques are not appropriate for gray-level or color watermarks.

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Keywords

Security, Visual Cryptography, half tone images, embedding, extraction, dithering matrix.