Constructions and Properties of k out of nVisual Secret Sharing Schemes
Designs, Codes and Cryptography
New Colored Visual Secret Sharing Schemes
Designs, Codes and Cryptography
Threshold Visual Cryptography Schemes with Specified Whiteness Levels of Reconstructed Pixels
Designs, Codes and Cryptography
Improved Schemes for Visual Cryptography
Designs, Codes and Cryptography
Constructions and Bounds for Visual Cryptography
ICALP '96 Proceedings of the 23rd International Colloquium on Automata, Languages and Programming
Visual Authentication and Identification
CRYPTO '97 Proceedings of the 17th Annual International Cryptology Conference on Advances in Cryptology
Image encryption by random grids
Pattern Recognition
Efficient visual secret sharing scheme for color images
Pattern Recognition
Image hiding based on circular geometric moiré
MATH'09 Proceedings of the 14th WSEAS International Conference on Applied mathematics
Image hiding based on circular moiré fringes
WSEAS Transactions on Mathematics
Visual multiple secret sharing based upon turning and flipping
Information Sciences: an International Journal
Threshold visual secret sharing by random grids
Journal of Systems and Software
Visual Multiple-Secret Sharing by Circle Random Grids
SIAM Journal on Imaging Sciences
Multi-image encryption by circular random grids
Information Sciences: an International Journal
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
Optimal (2,n) and (2,infinity) visual secret sharing by generalized random grids
Journal of Visual Communication and Image Representation
Random grid-based visual secret sharing with abilities of OR and XOR decryptions
Journal of Visual Communication and Image Representation
Image sharing method for gray-level images
Journal of Systems and Software
Improving the visual quality of random grid-based visual secret sharing
Signal Processing
Block-based progressive visual secret sharing
Information Sciences: an International Journal
Quality-adaptive visual secret sharing by random grids
Journal of Systems and Software
XOR-based meaningful visual secret sharing by generalized random grids
Proceedings of the first ACM workshop on Information hiding and multimedia security
Threshold visual secret sharing by random grids with improved contrast
Journal of Systems and Software
Improved tagged visual cryptography by random grids
Signal Processing
A new 1D chaotic system for image encryption
Signal Processing
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In this paper, we first give a formal definition to the visual cryptograms of n (=2) random grids (VCRG-n) for encrypting an image. Specifically, a set of VCRG-n with respect to image P consists of n random grids printed on transparencies such that only when the n transparencies are superimposed altogether can P be recognized by human vision (without any computing device), while any group of less than n transparencies obtains no information about P. Then, we design novel VCRG-n encryption schemes for binary, gray-level and color images, validate the correctness by formal proofs and demonstrate the feasibility by computer simulations. Our schemes do not require any extra pixel expansion neither any encoding basis matrix, which are necessary and inevitable in the approaches of conventional visual cryptography. These attractive advantages make our schemes more informative in theoretical interests and much applicable in practical applications.