[11706] in cryptography@c2.net mail archive
Re: unforgeable optical tokens?
daemon@ATHENA.MIT.EDU (Marc Branchaud)
Fri Sep 20 13:53:13 2002
Date: Fri, 20 Sep 2002 10:50:00 -0700
From: Marc Branchaud <marcnarc@rsasecurity.com>
To: cryptography@wasabisystems.com
Perry E. Metzger wrote:
>=20
> But if you can't simulate the system, that implies that the challenger
> has to have stored the challenge-response pairs because he can't just
> generate them, right? That means that only finitely many are likely to
> be stored. Or was this thought of too?
According to the article at http://www.msnbc.com/news/810083.asp :
=93We have about a terabit =97 a one followed by twelve zeros =97 of
information contained in a penny=92s worth of material,=94 said
Gershenfeld.
...
In practice, the combination of laser light inputs and resulting
speckle pattern outputs for each token could be stored on a secure
database. The token could then be read at a terminal that queries
the database and authenticates the token=92s identity.
I don't know just how practical this would be, in practice...
BTW, I think the Science article cited in the above article & on Pappu's
web site is available to Science subscribers (of which I'm not) at
http://www.sciencemag.org/cgi/search?volume=3D&firstpage=3D&author1=3DGer=
shenfeld%2C+N&author2=3DPappu%2C+R&titleabstract=3D&fulltext=3D&fmonth=3D=
Oct&fyear=3D1995&tmonth=3DSep&tyear=3D2002&hits=3D10&sendit.x=3D30&sendit=
.y=3D6&sendit=3DSearch
(The above URL may have been munged...)
M.
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