[14236] in cryptography@c2.net mail archive
RE: quantum hype
daemon@ATHENA.MIT.EDU (Michael_Heyman@NAI.com)
Mon Sep 22 10:34:31 2003
X-Original-To: cryptography@metzdowd.com
X-Original-To: cryptography@metzdowd.com
Date: Mon, 22 Sep 2003 09:06:28 -0400
From: <Michael_Heyman@NAI.com>
To: <cryptography@metzdowd.com>
> From: owner-cryptography@metzdowd.com
> [mailto:owner-cryptography@metzdowd.com]On Behalf Of Dave Howe
>=20
> Peter Fairbrother may well be in possession of a break for the QC hard
> problem - his last post stated there was a way to "clone" photons with
> high accuracy in retention of their polarization
> [SNIP]
>
Not a break at all. The physical limit for cloning is 5/6ths of the bits =
will clone true. Alice need only send 6 bits for every one bit desired =
to assure Eve has zero information. For a 256-bit key negotiation, Alice =
sends 1536 bits and hashes it down to 256 bits for the key.
-Michael Heyman
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