Clever. I will talk the DoD into implementing it with "Google Tap!"
________________________________
From: KZK <evil.ke...@gmail.com>
To: brin-l@mccmedia.com
Sent: Thu, June 14, 2012 8:31:47 PM
Subject: Brin: Quantum Cryptography Outperformed By Thermodynamics
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.
But Eve, who is listening in to the publicly available noise, does not know
which resistor was connected at each end and cannot work it out either because
the laws of thermodynamics prevent the extraction of this information from this
kind of signal.
-----
"It’s cheap to maintain Lies and expensive to maintain Trvth."
--KZK's Maxim
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