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Dot-Size Variant Visual Cryptography

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Digital Watermarking (IWDW 2009)

Part of the book series: Lecture Notes in Computer Science ((LNSC,volume 5703))

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Abstract

In this paper, we propose a scheme by which a secure random share can be generated using a dot-size variant form of visual cryptography (VC). We generate two extended style VC shares, when the share is viewed, it appears as a normal random visual cryptography share. However, this scheme is designed with spatial filtering in mind, this is the dot-size variant part of the scheme. Dot-size variant means that instead of having single black and white dots which make up a VC share, we use a cluster of smaller dots to represent these black and white pixels. This means that after printing, if the share is scanned or photocopied or even viewed with a mobile phone or digital camera, the smallest dots in the scheme are filtered. This loss of information during the copying process allows the original share to have additional security in that accurate copies cannot be created, as well as the fact that due to this loss, the copied share looks totally different from the original. This technique can be used to detect possible counterfeit shares and copies as they will be noticeably different from the original. One major advantage of our scheme is that it works with traditional print techniques and required no special materials. We present our results within this paper.

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Author information

Authors and Affiliations

  1. Queen’s University Belfast, Belfast, BT7 1NN, UK

    Jonathan Weir & Wei-Qi Yan

Authors
  1. Jonathan Weir
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  2. Wei-Qi Yan
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Editor information

Editors and Affiliations

  1. Faculty of Engineering and Physical Sciences, Department of Computing, University of Surrey, GU2 7XH, Guildford, Surrey, UK

    Anthony T. S. Ho

  2. New Jersey Institute of Technology, University Heights, 07102-1982, Newark, NJ, USA

    Yun Q. Shi

  3. Multimedia Security Lab, Korea University, Science Campus, 136-701, Seoul, Korea

    H. J. Kim

  4. Department of Information Engineering, University of Siena, Via Roma 56, 53100, Siena, Italy

    Mauro Barni

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© 2009 Springer-Verlag Berlin Heidelberg

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Weir, J., Yan, WQ. (2009). Dot-Size Variant Visual Cryptography. In: Ho, A.T.S., Shi, Y.Q., Kim, H.J., Barni, M. (eds) Digital Watermarking. IWDW 2009. Lecture Notes in Computer Science, vol 5703. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-03688-0_14

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  • DOI: https://doi.org/10.1007/978-3-642-03688-0_14

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-03687-3

  • Online ISBN: 978-3-642-03688-0

  • eBook Packages: Computer ScienceComputer Science (R0)

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