Visual cryptography for general access structures
Information and Computation
Protecting digital media content
Communications of the ACM
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
Contrast Optimal Threshold Visual Cryptography Schemes
SIAM Journal on Discrete Mathematics
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
New Size-Reduced Visual Secret Sharing Schemes with Half Reduction of Shadow Size
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
High-performance JPEG steganography using complementary embedding strategy
Pattern Recognition
ICIAR'06 Proceedings of the Third international conference on Image Analysis and Recognition - Volume Part I
Extended visual secret sharing schemes with high-quality shadow images using gray sub pixels
ICIAR'05 Proceedings of the Second international conference on Image Analysis and Recognition
Real perfect contrast visual secret sharing schemes with reversing
ACNS'06 Proceedings of the 4th international conference on Applied Cryptography and Network Security
Image hatching for visual cryptography
ACM Transactions on Multimedia Computing, Communications, and Applications (TOMCCAP) - Special Issue on Multimedia Security
Authenticating visual cryptography shares using 2d barcodes
IWDW'11 Proceedings of the 10th international conference on Digital-Forensics and Watermarking
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In this paper, we propose a scheme by which a secure random share can be generated using a dot-size variant form of visual cryptography (VC). We generate two extended style VC shares, when the share is viewed, it appears as a normal random visual cryptography share. However, this scheme is designed with spatial filtering in mind, this is the dot-size variant part of the scheme. Dot-size variant means that instead of having single black and white dots which make up a VC share, we use a cluster of smaller dots to represent these black and white pixels. This means that after printing, if the share is scanned or photocopied or even viewed with a mobile phone or digital camera, the smallest dots in the scheme are filtered. This loss of information during the copying process allows the original share to have additional security in that accurate copies cannot be created, as well as the fact that due to this loss, the copied share looks totally different from the original. This technique can be used to detect possible counterfeit shares and copies as they will be noticeably different from the original. One major advantage of our scheme is that it works with traditional print techniques and required no special materials. We present our results within this paper.