Two layers are combine |
In Visual Cryptography, two transparent images are created: one layer with random pixels, and a second layer with the secret information. Visual Cryptography works with layers with either identical or complementary pixels, a visual version of XOR-ing. Reading the information is only possible when both layers are aligned exactly on top of each other.
If true (crypto secure) randomness is used to generate the pixels for the first layer, it can be seen as a one-time pad system. In this case, retrieving the secret information from one of the layers is impossible if not in possession of the other layer, and Visual Cryptography offers absolute security.
More on Visual Cryptography on my website. Dutch reader can go to this page.
2 comments:
You have one of the most interesting and unique blogs I read. Fascinating, I wish I understood it in more depth :)
simple and exact
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