Super Secret Spy Message

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Mark Thoni's picture
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Joined: 18 Oct 2006 - 4:54pm
Super Secret Spy Message
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I have been trying to find any information on how to print secret messages. The concept is simple, print a message in red with a blue pattern over the top to disguise the message. The recipient would then use a blue-filmed set of glasses to filter the blue pattern and reveal the message. Over the years, I have subscribed to over a half dozen different design magazines and could have sworn I saw a how to article on this very subject. But, wouldn't you know it, when I actually want to attempt this technique, I can't find the article.

Thanks for any assistance you may provide.

Mark

Michel Boyer's picture
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Joined: 2 Jun 2007 - 1:01pm
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Here is a relevant reference:

Young-Chang Hou, Visual cryptography for color images, Pattern Recognition, Volume 36, Issue 7, July 2003, Pages 1619-1629, ISSN 0031-3203, DOI: 10.1016/S0031-3203(02)00258-3.
(http://www.sciencedirect.com/science/article/B6V14-485P5TH-1/2/5a3cf1878...)
Keywords: Visual cryptography; Halftone technology; Color decomposition; Information sharing