Abstract

Visual cryptography is a technique that encrypts a secret image into n shares with each participant holding one or more shares. Visual cryptography has a number of applications. It is used for transmitting financial documents, banking applications, remote electronic voting applications, sharing secret information, authentication & validation. In day to day life information is increasingly important and gets more value when shared with others. To provide security for sharing information various techniques proposed for the visual cryptography. This proposed work presents a detail survey of different visual cryptography techniques and comparative study of these techniques. In this paper we provide a review of various techniques used for visual cryptography. We discuss various visual cryptography techniques like Halftone Visual Cryptography Scheme, Multiple Secret Sharing Scheme, Extended Visual Cryptography Scheme, Visual secret sharing, Natural Image Based Visual Secret Sharing etc.

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