*WARNING* I have not idea about what Iam about to talk. This is a midnight rant. Take it as it is. *WARNING* I just finished reading the article on Holographic Memories on the latest Scientific America by Demetri Psaltis and Fai Mok. At the end they mention that "Given a hologram, either one of the two beams that interfered to create it can be used to reconstruct the other. What this means, in a holographic memory, is that it is possible not only to orient a reference beam into the crystal at a certain angle to select an individual holographic page but also to accomplish the reverse. Illuminating a crystal with one of the stored images gives rise to an approximation of the associated reference beam, reproduced as a plane wave emanating from the crystal at the appropriate angle." I was thinking this is simply a kind of XOR here given one image you can obtain the other. No this convined with the fact that you need to know the right angle could make for some interesting stuff. You could make a system where you give it the initial angle and password which is illuminated into the cristal to reveal the encoded data add to this some feadback mechanism where the angle changes depending on some function of the data and things get interesting. Its late and Iam tired. But if anyone has any ideas I woulkd love to heard them. Good nite. Aleph One / aleph1@dfw.net http://underground.org/ KeyID 1024/948FD6B5 Fingerprint EE C9 E8 AA CB AF 09 61 8C 39 EA 47 A8 6A B8 01