Andreas O. Bender
Abstract
Some national post offices offer postage stamps showing an image chosen by the customer, but in at least one case, an image was refused for political reasons. Visual cryptography was used to get the post office to produce two stamps showing images which are closely related to the rejected image. They look like random graphic designs, but the original image appears when the two graphic designs are held one on top of the other and lit from the back.
- W. Burger and M. J. Burge. Digital Image Processing -- An Algorithmic Introduction Using Java. Springer--Verlag, 2008. Google Scholar
Digital Library
- M. Naor and A. Shamir. Visual Cryptography. In A. DeSantis, editor, Advances in Cryptology - EUROCRYPT 1994, volume 950 of Lecture Notes in Computer Science, pages 1--12. Springer--Verlag, 1995.Google Scholar
Index Terms
- Visual cryptography on postage stamps
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