A secret-sharing-based method for authentication of grayscale document images via the use of the PNG image with a data repair capability

Che Wei Lee*, Wen-Hsiang Tsai 

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

A new blind authentication method based on the secret sharing technique with a data repair capability for grayscale document images via the use of the Portable Network Graphics (PNG) image is proposed. An authentication signal is generated for each block of a grayscale document image, which, together with the binarized block content, is transformed into several shares using the Shamir secret sharing scheme. The involved parameters are carefully chosen so that as many shares as possible are generated and embedded into an alpha channel plane. The alpha channel plane is then combined with the original grayscale image to form a PNG image. During the embedding process, the computed share values are mapped into a range of alpha channel values near their maximum value of 255 to yield a transparent stego-image with a disguise effect. In the process of image authentication, an image block is marked as tampered if the authentication signal computed from the current block content does not match that extracted from the shares embedded in the alpha channel plane. Data repairing is then applied to each tampered block by a reverse Shamir scheme after collecting two shares from unmarked blocks. Measures for protecting the security of the data hidden in the alpha channel are also proposed. Good experimental results prove the effectiveness of the proposed method for real applications.

Original languageEnglish
Article number5893939
Pages (from-to)207-218
Number of pages12
JournalIEEE Transactions on Image Processing
Volume21
Issue number1
DOIs
StatePublished - 1 Jan 2012

Keywords

  • Data hiding
  • data repair
  • grayscale document image
  • image authentication
  • Portable Network Graphics (PNG) image
  • secret sharing

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