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Improved Data Hiding Technique for Shares in Extended Visual Secret Sharing Schemes

  • Rabia Sirhindi
  • Saeed Murtaza
  • Mehreen Afzal
Part of the Lecture Notes in Computer Science book series (LNCS, volume 5308)

Abstract

An improved data hiding technique is proposed in this paper to hide the shares of a secret image in an Extended Visual Secret Sharing (EVSS) scheme. It is based on Least Significant Bit (LSB) substitution with a little modification that the embedding capacity varies with each pixel of the host image and depends upon the surrounding pixels’ color difference. This not only increases the embedding capacity of the host image as compared to simple LSB substitution but also yields high Peak Signal to Noise Ratio (PSNR) values for host and stego images. Moreover, results indicate that the proposed data hiding process improves the security of camouflage images in EVSS schemes since shares are completely hidden in the cover images without any trace of their presence, unlike most of the previous share hiding approaches, thus preventing shares from alteration during transmission.

Keywords

Visual cryptography extended visual secret sharing data hiding LSB encoding adaptive LSB encoding 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2008

Authors and Affiliations

  • Rabia Sirhindi
    • 1
  • Saeed Murtaza
    • 1
  • Mehreen Afzal
    • 1
  1. 1.College of SignalsNational University of Sciences and TechnologyPakistan

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