Digital halftones by dot diffusion
ACM Transactions on Graphics (TOG)
Visual cryptography for general access structures
Information and Computation
Constructions and Properties of k out of nVisual Secret Sharing Schemes
Designs, Codes and Cryptography
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
Threshold Visual Cryptography Schemes with Specified Whiteness Levels of Reconstructed Pixels
Designs, Codes and Cryptography
Determining the Optimal Contrast for Secret Sharing Schemes in Visual Cryptography
Combinatorics, Probability and Computing
New visual secret sharing schemes using probabilistic method
Pattern Recognition Letters
Cheating in Visual Cryptography
Designs, Codes and Cryptography
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
Halftone visual cryptography via error diffusion
IEEE Transactions on Information Forensics and Security
A new definition of the contrast of visual cryptography scheme
Information Processing Letters
Step construction of visual cryptography schemes
IEEE Transactions on Information Forensics and Security
Threshold visual secret sharing by random grids
Journal of Systems and Software
Random grid-based visual secret sharing for general access structures with cheat-preventing ability
Journal of Systems and Software
Yet another multiple-image encryption by rotating random grids
Signal Processing
IEEE Transactions on Image Processing
Cheating Prevention in Visual Cryptography
IEEE Transactions on Image Processing
User-Friendly Random-Grid-Based Visual Secret Sharing
IEEE Transactions on Circuits and Systems for Video Technology
An Extended Visual Cryptography Algorithm for General Access Structures
IEEE Transactions on Information Forensics and Security - Part 2
Random grid-based visual secret sharing with abilities of OR and XOR decryptions
Journal of Visual Communication and Image Representation
Improving the visual quality of random grid-based visual secret sharing
Signal Processing
Threshold visual secret sharing by random grids with improved contrast
Journal of Systems and Software
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Tagged visual cryptography (TVC) is a brand new type of visual cryptography (VC) in which additional tags are concealed into each generated share. By folding up each single share, the associated tagged pattern is visually revealed. Such additional tag patterns greatly enrich extra abilities of VC, such as augmented message carried in a single share, user-friendly interface to manage the shares, and/or evidence for verifying consistency among those shares cooperating in a decryption instance. However, reported (k, n) TVC proposed by Wang and Hsu still suffers from the defects such as pixel expansion, code book required in the encoding phase and low image quality. In this work, a (k, n) TVC by adopting the concept of random grid (RG) is introduced. The proposed method can solve the pixel expansion and code book needed problems. Further, cheating activity can be prevented by the proposed algorithm. Superior visual quality of both the recovered secret image and reconstructed tag image is provided as well according to the theoretical analysis and demonstrated experiments.