Natural language letter based visual cryptography scheme

Authors:
Hsiao-Ching Lin;Ching-Nung Yang;Chi-Sung Laih;Hui-Tang Lin
Affiliations:
Institute of Computer and Communication Engineering, National Cheng Kung University, Taiwan;Department of Computer Science and Information Engineering, National Dong Hwa University, Taiwan;Department of Electrical Engineering, National Cheng Kung University, Taiwan;Department of Electrical Engineering, National Cheng Kung University, Taiwan
Venue:
Journal of Visual Communication and Image Representation
Year:
2013

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Abstract

Naor and Shamir proposed the notion of a (k,n) visual cryptography scheme (VCS), which allows k or more stacked transparent share images to reveal a secret image. It can be used without prerequisite knowledge of cryptography or complex computations. In these schemes, no information about the secret can be obtained from fewer than k shares. Previous VCSs use black and white subpixels to create share images. In this paper, we present a letter-based VCS (LVCS) where pixels are replaced by letters for the share images. Shares can now be constructed using meaningful data as subterfuge all while carrying secret data in plain sight, and an adversary will not recognize them as containing secrets. We prove that the proposed (k,n)-LVCS satisfies contrast and security conditions and secret information may be reconstructed by any k shares but with less than k shares reveal nothing.