An extended secret sharing scheme for colour images with fixed pixel expansion

Authors:
Rabia Sirhindi;Mehreen Afzal;Saeed Murtaza
Affiliations:
Department of Information Security, College of Signals, National University of Sciences and Technology, Humanyun Road, Rawalpindi 46000, Pakistan.;Department of Information Security, College of Signals, National University of Sciences and Technology, Humanyun Road, Rawalpindi 46000, Pakistan.;Department of Information Security, College of Signals, National University of Sciences and Technology, Humanyun Road, Rawalpindi 46000, Pakistan
Venue:
International Journal of Electronic Security and Digital Forensics
Year:
2009

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Abstract

An extended visual secret sharing scheme uses multiple innocent-looking cover images to hide a secret image such that none discloses any portion of the secret. In this article, an extended secret sharing technique is proposed that shares a secret colour image in a couple of significant images using a fixed pixel expansion factor of 9 for a colour space as large as comprising 224, i.e. 16 million colours approximately. Furthermore, the data hiding technique employed in this article uses all three planes of a colour image which reduces the number of cover images that would otherwise be needed. Recovery is performed through a simple stacking (XOR) operation and a sequence of random integers.