1993-03-26 - Re: TEMPEST in a teapot

Header Data

From: pete@cirrus.com (Pete Carpenter)
To: grady@public.btr.com
Message Hash: aa95b75d2330d21b40037e739cbdc31a541160de98fa277723752188590f184b
Message ID: <9303262028.AA11335@ss2138.cirrus.com>
Reply To: N/A
UTC Datetime: 1993-03-26 20:51:45 UTC
Raw Date: Fri, 26 Mar 93 12:51:45 PST

Raw message

From: pete@cirrus.com (Pete Carpenter)
Date: Fri, 26 Mar 93 12:51:45 PST
To: grady@public.btr.com
Subject: Re:  TEMPEST in a teapot
Message-ID: <9303262028.AA11335@ss2138.cirrus.com>
MIME-Version: 1.0
Content-Type: text/plain

----- Begin Included Message -----

It is speculated that poorly protected systems can
be effectively monitored up to the order of one kilometer from the target

----- End Included Message -----

The "readability" of the relatively high energy sweeps in a standard CRT monitor
is well known. Any idea of similar effects on LCD screens ?  The energy involved
would be orders of magnitude less, just for starters.  Also, since the whole screen
is effectively oscillating, I'm not sure that there is any 'raster' sweep per se
going on here at all.  This could be a factor for the truly paranoid :-) using 
portables with LCD screens.

Pete Carpenter                           pete@cirrus.com
Talk about your plenty, talk about your ills,
One man gathers what another man spills. - Robert Hunter