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Date: Thu, 14 Feb 2002 07:50:41 -0600 (CST)
From: Jesse Pollard <pollard@tomcat.admin.navo.hpc.mil>
Message-Id: <200202141350.HAA29931@tomcat.admin.navo.hpc.mil>
To: gurre@start.no, Rob Landley <landley@trommello.org>
Subject: Re: ssh primer (was Re: pull vs push (was Re: [bk patch] Make
 cardbus compile in -pre4))
Cc: Aaron Lehmann <aaronl@vitelus.com>, Jeff Garzik <jgarzik@mandrakesoft.com>,
        Herbert Xu <herbert@gondor.apana.org.au>, linux-kernel@vger.kernel.org
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------HEADER END-DONT REMOVE------ 
> Rob Landley <landley@trommello.org> writes:
> 
> > Not that it's worth it. Keys get exponentially more difficult to
> > brute force as the key length increases. I read part of a book a
> > long time ago (might have been called "applied cryptography") that
> > figured out that if you could build a perfectly efficient computer
> > that could do 1 bit's worth of calculation with the the amount of
> > energy in the minimal electron state transition in a hydrogen atom,
> > and you built a dyson sphere around the sun to capture its entire
> > energy output for the however many billion years its expected to
> > last, you wouldn't even brute-force exhaust a relatively small
> > keyspace (128 bits? 256 bits? Something like that).
> >
> > Somebody else here is likely to recognize the above anecdote and give a more 
> > accurate reference.  Book title and page number would be good...
> 
> Bruce Schneier's "Applied Cryptography" (second edition, may be in the
> first edition as well), pages 157-158 ("Thermodynamic Limitations").
Remember - this is a dated example, since some theories are beginning
to consider storing & computing data with photons/interference patterns...
-------------------------------------------------------------------------
Jesse I Pollard, II
Email: pollard@navo.hpc.mil
Any opinions expressed are solely my own.
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