Re: interesting article on quantum cryptography
- From: "Douglas A. Gwyn" <DAGwyn@xxxxxxxx>
- Date: Thu, 26 Apr 2007 21:15:07 GMT
Antony Clements wrote:
... since according to the
article quantum cryptography works with photons, and many of todays
encryption schemes use XOR, how would a quantum cryptographic scheme work
with such a function. except maybe to comparethe intensity of one photon
with the intensity of another and the result being the difference in their
respective inensities.
There are several issues involved; generally saying "XOR is involved"
is pointless, since there are a large number of arithmetic and
logical operations involved in implementing the crypto algorithm.
There is "quantum computing" (QC), which should apply to any algorithm,
with known advantages over conventional computing (once QC is available
on a large scale) in the case of *some* kinds of algorithms. QC could
be applied to any crypto algorithm, "XOR-based" or not.
However, "quantum cryptography" (alas, also "QC") usually denotes the
exploitation of quantum coherence to implement secure communication
channels. The basic principle is that any eavesdropping is detectable
by the legitimate communicants. Alternatively, the eavesdropper may
only be able to obtain "information" that does him no good with respect
to recovering the plaintext or key.
Photons are used in implementations because they are much easier to
work with at the quantum-coherence level than any other phenomenon
(e.g. electrons).
There is a lot of tutorial information for this field available on line,
for example http://en.wikipedia.org/wiki/Quantum_cryptography
.
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