On Sun, 10 Dec 1995, Daniel Miskell wrote:
I think i was misunderstood. I was not referring to the actual use of light in the communications process. I was talking about the key generation method suggested in that article. Of course the use of light is impractical for most - the need for direct fiberoptics aside, you have to be able to test a photon for its polarized orientation. In any case, i dig on.
I didn't read the Discover article, but I did see it in Applied Crypto, 1st edition. The polarization thing was used for eavesdropper detection, rather than key generation (I think, and I may be quite wrong). The paper was intended to show that you could have unconditional security even if P=NP (I even think that was one of the paper titles), so the authors used a one time pad (and used whatever key generation method is usually used for OTPs, ie coin flips, real RNGs and whatnot). So nothing special or new with regards to key generation. (Of course they may have newer papers...Any hints folks?) Incidentally, Brassard wrote a nice and very short intro to modern crypto that's in the Springer-Verlag Lecture Notes in Computer Science series. I think Applied Cryptology was the title. It had good coverage of his quantum crypto scheme. It ought to be in any university library.