A hierarchical threshold secret image sharing

  • Authors:

  • Cheng Guo;Chin-Chen Chang;Chuan Qin

  • Affiliations:

  • Department of Computer Science, National Tsing-Hua University, Hsinchu 30013, Taiwan, ROC;Department of Information Engineering and Computer Science, Feng Chia University, No. 100 Wenhwa Rd., Seatwen, Taichung 40724, Taiwan, ROC and Department of Biomedical Imaging and Radiological Sci ...;Department of Information Engineering and Computer Science, Feng Chia University, No. 100 Wenhwa Rd., Seatwen, Taichung 40724, Taiwan, ROC

  • Venue:
  • Pattern Recognition Letters
  • Year:
  • 2012

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Abstract

In the traditional secret image sharing schemes, the shadow images are generated by embedding the secret data into the cover image such that a sufficient number of shadow images can cooperate to reconstruct the secret image. In the process of reconstruction, each shadow image plays an equivalent role. However, a general threshold access structure could have other useful properties for the application. In this paper, we consider the problem of secret shadow images with a hierarchical threshold structure, employing Tassa's hierarchical secret sharing to propose a hierarchical threshold secret image sharing scheme. In our scheme, the shadow images are partitioned into several levels, and the threshold access structure is determined by a sequence of threshold requirements. If and only if the shadow images involved satisfy the threshold requirements, the secret image can be reconstructed without distortion.