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Using Color Visual Cryptography Schemes and Watermarking for Sharing Black and White Secret Images

Published on February 2015 by Suju R, Seena Thomas
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Advanced Computing and Communication Techniques for High Performance Applications
Foundation of Computer Science USA
ICACCTHPA2014 - Number 2
February 2015
Authors: Suju R, Seena Thomas
54239ec5-205c-4dbe-98a5-0e2ecd51658e

Suju R, Seena Thomas . Using Color Visual Cryptography Schemes and Watermarking for Sharing Black and White Secret Images. Advanced Computing and Communication Techniques for High Performance Applications. ICACCTHPA2014, 2 (February 2015), 32-38.

@article{
author = { Suju R, Seena Thomas },
title = { Using Color Visual Cryptography Schemes and Watermarking for Sharing Black and White Secret Images },
journal = { Advanced Computing and Communication Techniques for High Performance Applications },
issue_date = { February 2015 },
volume = { ICACCTHPA2014 },
number = { 2 },
month = { February },
year = { 2015 },
issn = 0975-8887,
pages = { 32-38 },
numpages = 7,
url = { /proceedings/icaccthpa2014/number2/19443-6025/ },
publisher = {Foundation of Computer Science (FCS), NY, USA},
address = {New York, USA}
}
%0 Proceeding Article
%1 Advanced Computing and Communication Techniques for High Performance Applications
%A Suju R
%A Seena Thomas
%T Using Color Visual Cryptography Schemes and Watermarking for Sharing Black and White Secret Images
%J Advanced Computing and Communication Techniques for High Performance Applications
%@ 0975-8887
%V ICACCTHPA2014
%N 2
%P 32-38
%D 2015
%I International Journal of Computer Applications
Abstract

Visual cryptography is a new secure technology that distributes a secret image by separating it into a number of shares using different visual cryptography schemes (VCS). Early VCS schemes mainly focused on black-and-white secret images. Using a black & white VCS normally degrade the image quality and also suffered from a major drawback of pixel expansion, which means that the size of each secret share is several times larger than that of the original image. The black & white VCS were extended to the colour VCS. The main problem with the colour VCS is larger pixel expansion when number of colours increases. So in order to avoid these drawbacks a scheme called Black&White-Colour Visual Cryptography Scheme (B&W-C VCS) is used here. This scheme exploits the colour model to split a b & w image into coloured shares using a smaller pixel expansion and improved contrast. For any of the VCS, the main issue to be considered is authentication, i. e. , there are no means by which one can ensure that the secret recovered is genuine. It would be advantageous to check the fidelity of the shares before they are used to reconstruct the secret. For this purpose, this paper proposes a watermark method to authenticate coloured shares thereby ensuring a successful secret recovery. Unlike other watermarking techniques, the pattern is not directly embedded into the share, but an authentication matrix is generated which checks the authenticity of the shares before they are used for secret recovery.

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Index Terms

Computer Science
Information Sciences

Keywords

Secret Sharing Visual Cryptography Threshold Schemes B&w Secret Images Color Shares watermarking