At 11:31 PM Thursday 6/14/2012, KZK wrote:
http://www.technologyreview.com/view/428202/quantum-cryptography-outperformed-by-classical/
The idea is straightforward. Alice wants to send Bob a message via
an ordinary wire. At each end of the wire, there are two different
resistors that correspond to a 0 or 1.
Alice encodes her message by connecting these two resistors to the
wire in the required sequence.
Bob, on the other hand, connects his resistors to the wire at random.
The crucial part of this set up is that the actual current and
voltage through the wire is random, ideally Johnson noise. The
essential features of this noise are determined by the combination
of resistors at each end. This noise is public--anybody can see or measure it.
Now here's the clever bit. Bob knows which resistor he connected to
the wire and so can work out which resistor Alice must have connected.
So while this is going on, what are Carol and Ted up to?
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