Visual cryptography for general access structures
Information and Computation
Extended capabilities for visual cryptography
Theoretical Computer Science
Contrast-optimal k out of n secret sharing schemes in visual cryptography
Theoretical Computer Science - computing and combinatorics
New visual secret sharing schemes using probabilistic method
Pattern Recognition Letters
Aspect ratio invariant visual secret sharing schemes with minimum pixel expansion
Pattern Recognition Letters
Probabilistic Visual Cryptography Schemes
The Computer Journal
Image encryption by random grids
Pattern Recognition
Image encryption by multiple random grids
Pattern Recognition
Visual secret sharing by random grids revisited
Pattern Recognition
Probabilistic visual secret sharing schemes for grey-scale images and color images
Information Sciences: an International Journal
Random grid-based visual secret sharing with abilities of OR and XOR decryptions
Journal of Visual Communication and Image Representation
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Based on generalized random grids, this paper proposes two visual cryptography methods denoted as (2,n) GRG and (2,infinity) GRG. The (2,n) GRG is suitable for the pre-decided number of shares, and the (2,infinity) method is suitable for the adjustable number of shares. The proposed (2,n) GRG achieves better contrast on the stacking result, and the proposed (2,infinity) GRG enables extending the number of shares anytime. Based on the definition of contrast in Shyu's work in 2007, we also demonstrate that the stacking result of (2,n) GRG is close to the theoretical bound of the contrast, and the stacking result of (2,infinity) GRG achieves the theoretical bound of the contrast.