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An Overview of Visual Cryptography with Some Important Parameters

Aarti A, Harsh K Verma, Pushpendra K Rajput

Abstract


Visual cryptography scheme is a technique which allows visual information (handwritten notes, printed documents etc) to be
encrypted in such a way that the decryption can be performed by the human visual system easily without the use of any
computer and without knowledge about Cryptography. VCS convert the written material into n shadow image called
shares in which particular share reveal no information about the original secret image. But when selecting the
some subsets of share and superimpose their transparency, original information is revealed. Visual Cryptography has
proved that security can be attained with even simple encryption schemes. There are various parameters on which
performance of visual cryptography scheme depends(type of secret image, number of secret images, accuracy etc) but two
most two important parameters in VCS are the contrast and the pixel expansion where contrast provide how much clearness in
recovered secret image and pixel expansion tells about the size of reconstructed image. In this survey paper, we will discuss
various VCS scheme and comparison among them based upon parameters and some extended work on this.

Keywords


Visual Cryptography Scheme (VCS), pixel expansion, contrast, security.

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