[52121] in Cypherpunks
Re: Beat Remote Monitor Snooping?
daemon@ATHENA.MIT.EDU (jim bell)
Thu Mar 14 04:52:58 1996
Date: Wed, 13 Mar 1996 22:44:28 -0800
To: Alan Horowitz <alanh@infi.net>, JonWienke@aol.com
From: jim bell <jimbell@pacifier.com>
Cc: cypherpunks@toad.com
At 10:46 PM 3/13/96 -0500, Alan Horowitz wrote:
>Visual contrast is not the same thing as frequency diffrence. It is quite
>easy to measure extremely small changes of phase. As in, your
>plain-vanilla FM receiver.
However, that's not how SVGA CRT's do it. NTSC (TV video) modulation is done by phase modulation of the 3.579545 MHz subcarrier. SVGA has three different baseband analog signals feeding three electron beams.
Even so, they still should be able to pick up SVGA with a little tinkering.
> What's his name put this stuff together in the
>mid 1930's.
Ed Armstrong
