more on ARMSTRONG LECTURE on Quantum Crypto and Optical Networks (Forwarded)

[David Farber <dave () farber net>]

Begin forwarded message:

From: Joe Touch <touch () ISI EDU>
Date: September 19, 2005 1:53:41 PM EDT
To: dave () farber net
Cc: smb () cs columbia edu
Subject: Re: [IP] ARMSTRONG LECTURE on Quantum Crypto and Optical  
Networks (Forwarded)


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Dave and Steve,

So far I've been very curious about all the assertions about quantum
comm. supporting key distribution, since quantum comm presumes
pre-distributed keys for state verification, at least as a bootstrap.  
See:

    Why Quantum Cryptography?
    Kenneth G. Paterson, Fred Piper, Ruediger Schack (Royal
    Holloway, University of London
    in Quantum Physics e-print archive, June 2004

Abstract:
Quantum Key Exchange (QKE, also known as Quantum Key Distribution or
QKD) allows communicating parties to securely establish cryptographic
keys. It is a well-established fact that all QKE protocols require that
the parties have access to an authentic channel. Without this
authenticated link, QKE is vulnerable to man-in-the-middle attacks.
Unfortunately this fact is frequently overlooked, resulting in
exaggerated claims and/or false expectations about the potential impact
of QKE. In this paper we present a systematic comparison of QKE with
traditional key exchange protocols in realistic secure communication
systems.
http://arXiv.org/abs/quant-ph/0406147

I've heard various assertions about 'key amplification', 'pad
regeneration', etc., but at the end of the day it seems that the quantum
system is only as good as the conventional authentication key it started
with, AFAICT.

I'd be interested if any others on IP have thoughts on this...

Joe



David Farber wrote:

> is it webcast?
>
>
> Begin forwarded message:
>
> From: "Steven M. Bellovin" <smb () cs columbia edu>
> Date: September 14, 2005 6:35:23 PM EDT
> To: cryptography () metzdowd com
> Subject: [Colloquium] ARMSTRONG LECTURE on Quantum Crypto and Optical
> Networks (Forwarded)
>
>
>
>
>
> Date: Wed, 14 Sep 2005 18:30:22 -0400 (EDT)
> From: Dan Rubenstein <danr () cs columbia edu>
> To: colloquium () cs columbia edu
>
>
> The Department of Electrical Engineering at Columbia University   
> invites
> you
> to attend
> THE ARMSTRONG MEMORIAL LECTURE
> Monday, September 19 - 3:00pm
> Davis Auditorium (Schapiro/Host)
>
> Host:  Professor Osgood
>
> "Unbreakable Secret Key Distribution?
> Quantum Cryptography and Optical Networks"
>
> by
>
> Matthew S. Goodman, Ph.D.,
> Chief Scientist and Telcordia Fellow, Telcordia Technologies &   
> Laboratory
> for Telecommunications Sciences Red Bank, NJ and Adelphi, MD
>
> Abstract:
> Manifestly quantum mechanical behavior has had tremendously important
> implications for the development of modern technology.  In this  
> talk we
> explore the impact of recent ideas and new approaches that quantum
> information is having on future secure communications for high   
> performance
> optical networks. The talk will concentrate on quantum  
> cryptography,  which
> offers the promise of unconditional security for communications, and
> complements existing mathematically based cryptography, which is
> applied at
> higher networking levels.  The talk will review the rapid progress  
> in  this
> field as well as some very recent experimental results from the   
> Telcordia
> research group and its collaborations.  We will describe the impact  
> that
> this work is having on optical networking research and some early
> commercial activities and will speculate on its broader commercial
> implications.
>
> Light refreshments will be served.  We look forward to seeing you  
> there!
>
> _______________________________________________
> Colloquium mailing list
> Colloquium () cs columbia edu
> http://lists.cs.columbia.edu/mailman/listinfo/colloquium
>
>
> ----------
>
>
>
>
>         --Steven M. Bellovin, http://www.cs.columbia.edu/~smb
>
>
>
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