Flip visual cryptography (FVC) with perfect security, conditionally-optimal contrast, and no expansion

Authors:
Sian-Jheng Lin;Shang-Kuan Chen;Ja-Chen Lin
Affiliations:
Department of Computer Science, National Chiao Tung University, Hsinchu, Taiwan;Department of Computer Science and Information Engineering, Yuanpei University, Hsinchu, Taiwan;Department of Computer Science, National Chiao Tung University, Hsinchu, Taiwan
Venue:
Journal of Visual Communication and Image Representation
Year:
2010

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Abstract

This paper proposes a flip visual cryptography (FVC) scheme with perfect security, conditionally optimal contrast, and no expansion of size. The proposed FVC scheme encodes two secret images into two dual-purpose transparencies. Stacking the two transparencies can reveal one secret image. Flipping one of the two transparencies and then stacking with the other transparency can reveal the second secret image. The proposed scheme is proved to have conditionally optimal contrast: its contrast is optimal if the double-secrets non-expanded FVC scheme is required to have perfect security. The perfect security is also proved.