From: Julian Assange <proff@suburbia.net>
Date: Wed, 29 May 1996 12:44:54 +0800
To: andrew_loewenstern@il.us.swissbank.com (Andrew Loewenstern)
Subject: Re: Tempest Info
In-Reply-To: <9605281908.AA00554@ch1d157nwk>
Message-ID: <199605282356.JAA29834@suburbia.net>
MIME-Version: 1.0
Content-Type: text


> 
> Bill Stewart writes:
> >  Also, of course, your electrical power system needs to be
> >  shielded and filtered, so only 60Hz gets through, unless you
> >  plan to stick to laptops and bring in spare battery packs.
> 
> At HoHoCon a few years ago, someone did a tempest demo and mentioned that  
> signals could be recovered from water pipes!  Fire sprinkler systems were  
> specifically mentioned...

Water pipes are often form the earth line. If only 60hz (US) can get through
the power cables then only 60 hz can get into the water pipes (I'll ignore
re-radiating, because water pipes are the least of your problems there).

-- 
"Of all tyrannies a tyranny sincerely  exercised for the good of its victims  
 may be the most  oppressive.  It may be better to live under  robber barons  
 than  under  omnipotent  moral busybodies,  The robber baron's  cruelty may  
 sometimes sleep,  his cupidity may at some point be satiated; but those who  
 torment us for own good  will torment us  without end,  for they do so with 
 the approval of their own conscience."    -   C.S. Lewis, _God in the Dock_ 
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