Re: The Elevator Problem

[Daniel Miskell <DMiskell@envirolink.org>]

s1113645@tesla.cc.uottawa.ca writes:
>
>
>On Sun, 10 Dec 1995, Daniel Miskell wrote:
>
>> There is an easy way to develop a secret key in front any number of eves, 
>>be  they experts or not, without the eves knowing what the key is.  Even if 
>>they  tap your phone/comm line, ect.  There was an article in Discovery 
>>Magazine a  couple of years ago, talking about how to use photons and their 
>>randomness as  the perfect, uncrackable code.  Use of the photons aside, 
>>there was a key  generation method discussed, simple, yet secure enough to 
>>work out on a tapped  phone.  Let me root around.
>
>You must mean quantum crypto, by G. Brassard and C. Crepeau of U de Montreal.
>Requires a direct fiber optic line from pt. A to B, in order to be 
>secure, if I am not mistaken. Which makes it impractical for most people, 
>as there are usually switches (or whatever they're called) and more than one 
>line in between. Lets you use OTPs with your next-door neighbor though.

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.

Regards,
Munster.

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