Re: [TSCM-L] Re: Acoustic Absorbing Materials

From: <d..._at_geer.org>
Date: Tue, 19 Sep 2006 00:16:12 -0400

trixter aka Bret McDanel writes:
 |
 | On Mon, 2006-09-18 at 23:13 -0400, d..._at_geer.org wrote:
 | >
 | > trixter aka Bret McDanel writes:
 | > >
 | > > And if no one is paying attention but someone does a frequency
 | > > sweep they will know the frequency its tuned to (because as soon
 | > > as they hit a carrier on the given freq it goes silent - this can
 | > > be done at night when no one is around).
 | > >
 |
 | > An eavesdropper hears white noise but the base station,
 | > as it knows what it is transmitting, has no difficulty
 | > subtracting it out and thus recovering the counterparty
 | > talking. So, in your example, you replace the naturally
 | > occuring white noise with your own white noise and,
 | > bingo, you can silence the room, so to speak. This
 | > would be oh such a nasty gotcha if one's opponent were
 | > to get physical access to your white noise generator
 | > and could thus pull this on you in reverse...
 |
 | yeah that was the section that you cut out when replying :)
 |

Then I didn't understand you -- you were trying to
locate the channel and to broadcast silence on that
channel? Or you were, and I was wrong to not see
it, saying that this trick of removing known white
noise to reveal whether anything was hiding in that
white noise?

Keep going, I'm fascinated.

--dan
Received on Sat Mar 02 2024 - 00:57:21 CST