Insight into collusion attacks in random-grid-based visual secret sharing

  • Authors:

  • Yao-Sheng Lee;Tzung-Her Chen

  • Affiliations:

  • Department of Computer Science and Information Engineering, National Chiayi University, Chiayi City, Taiwan 60004, ROC;Department of Computer Science and Information Engineering, National Chiayi University, Chiayi City, Taiwan 60004, ROC

  • Venue:
  • Signal Processing
  • Year:
  • 2012

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Abstract

Visual secret sharing (VSS), either visual-cryptography-based (VC-based) VSS or random-grid-based (RG-based) VSS, is a well-known technology of secret communication for sensitive security applications. Horng et al. (2006) kindled the interest in the cheating problem existing in threshold VC-based VSS. The cheating problem happened when dishonest participants collude to cheat honest ones by enabling the latter to accept the wrong secret information generated by the former. As RG-based VSS (RGVSS) has gained significant attention in academia in the past years, it is concerned that RG-based VSS may also suffer cheating attacks. The authors of the present study demonstrate that the security risk does exist in RG-based VSS. To prove the feasibility of cheating, the experimental results and formal analysis illustrate that the proposed collusion attacks do work.