Visual cryptography for general access structures
Information and Computation
An Implementation of Key-Based Digital Signal Steganography
IHW '01 Proceedings of the 4th International Workshop on Information Hiding
An Innocuous Visual Cryptography Scheme
WIAMIS '07 Proceedings of the Eight International Workshop on Image Analysis for Multimedia Interactive Services
Recursive Visual Cryptography Using Random Basis Column Pixel Expansion
ICIT '07 Proceedings of the 10th International Conference on Information Technology
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Steganography is the art and science of writing hidden messages in such a way that no one, apart from the sender and intended recipient, suspects the existence of the message. It is a form of security through obscurity. The word Steganography in the modern day usually refers to information or a file that has been concealed inside a digital Picture, Video or Audio file. Essentially, the information-hiding process in a steganographic system starts by identifying a cover medium's redundant bits. The embedding process creates a stego medium by replacing these redundant bits with data from the hidden message. In this paper a new type of cryptographic scheme is proposed, which can decode concealed images without any cryptographic computations. The scheme is perfectly secure and very easy to implement. This is extended into a visual variant of the k out of n secret sharing problem, in which a dealer provides a transparency to each one of the n users, any k of them can see the image by stacking their transparencies, but any k -- 1 of them gain no information about it.