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As technology progresses and as more and more personal data is digitized, there is even more of an emphasis required on data security today than there has ever been.
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About the book
As technology progresses and as more and more personal data is digitized, there is even more of an emphasis required on data security today than there has ever been. Protecting this data in a safe and secure way which does not impede the access of an authorized authority is an immensely difficult and very interesting problem. Many attempts have been made to solve this problem within the cryptographic community.
In this book, one of these data security methods known as visual cryptography (VC) is presented. Specifically, visual cryptography allows effective and efficient secret sharing between a number of trusted parties. As with many cryptographic schemes, trust is the most difficult part. Visual cryptography provides a very powerful technique by which one secret can be distributed into two or more shares. When the shares are xeroxed onto transparencies and then superimposed exactly together, the original secret can be discovered without computer participation.
Many types of visual cryptography are examined. From the very first type of traditional visual cryptography right up to the latest developments. Traditional VC specifically deals with sharing a single binary secret between a number of participants. Extended VC attempts to take this a step further by introducing shares that have significant visual meaning. This detracts from the suspicious looking encrypted shares that are generated using traditional methods. Dynamic, colour, progressive and image hatching VC schemes are also discussed.
Practical VC applications are also outlined. These applications involve the use of Moire patterns and watermarking techniques. Detailed analysis of the watermarking domain is presented along with various techniques and schemes that can incorporate VC successfully within the field of watermarking. The foundations of these techniques are reviewed and examples provided.
- Secret Sharing
- Visual Cryptography
- Size Invariant Visual Cryptography
- Recursive Visual Cryptography
- Analysis of Visual Cryptography
- Mathematical Background
- Analysis in the Frequency Domain
- Extended Visual Cryptography
- Halftone Visual Cryptography
- Cheating Immune VC Schemes
- Dot-Size Variant Visual Cryptography
- Basic Multiple Secret Sharing
- Embedding a Share of Visual Cryptography in a Halftone Image
- Colour Visual Cryptography
- Image Sharing Using Random Masks
- Quality Evaluation
- Progressive Visual Cryptography
- Image Hatching with VC
- Security Analysis
- Moire Patterns
- Criteria for Evaluation Purposes
About the Author
Dr WeiQi Yan received his Ph.D. degree from Institute of Computing Technology, Academia Sinica, China in 2001. His research interests include Multimedia Systems and Intelligent Multimedia Security, Forensics and Surveillance. He has over 90 publications. Dr Yan is serving as an associate editor for the Journal of Multimedia, an associate editor for the International Journal of Digital Crime Forensics, and a guest editor of the Springer Transactions on Data Hiding and Multimedia Security (DHMMS).
Jonathan Weir received his BSc. degree in computer science from Queen's University Belfast, UK, in 2008. He is currently pursuing his Ph.D. degree in computer science at Queen's University Belfast, UK. His research interests are visual cryptography, digital imagery and image processing.
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