$400 million network upgrade for the Pentagon

Wed Aug 14 15:31:15 UTC 2002

"fold back" systems like Bose noise cancelling headsets depend on the
microphones being adjacent to each other. The further apart they are the
more difficult it becomes to "sync" the noise. A digital delay helps but
at some point of source divergence even it won't help. 

Of course these measures are designed for inadvertent release of
information. Anyone with a window shouldn't be discussing things worth
eavesdropping on anyway. But in the real world...hence the air pipes.

Not that I would know anything about this sort of thing... ;0

Best regards,
_________________________
Alan Rowland

-----Original Message-----
From: owner-nanog at merit.edu [mailto:owner-nanog at merit.edu] On Behalf Of
Blake Fithen
Sent: Tuesday, August 13, 2002 3:13 PM
To: 'Brad Knowles'; 'gg'; 'Sean Donelan'; nanog at merit.edu
Subject: RE: $400 million network upgrade for the Pentagon

> Brad Knowles:
> 	The Pentagon has windows.  It also has an ancient system of air
> pipes aimed at all of the windows...

<paranoia>

Is this sensitive info?   Couldn't someone (theoretically) aim a
"beam" at an unoccupied office and another at their objective 
office then filter out the 'noise'?

</paranoia>

Sorry for the O.T.

--
blake

> Brad Knowles, <brad.knowles at skynet.be>
> 
> "They that can give up essential liberty to obtain a little temporary 
> safety deserve neither liberty nor safety."
>      -Benjamin Franklin, Historical Review of Pennsylvania.
> 
> GCS/IT d+(-) s:+(++)>: a C++(+++)$ UMBSHI++++$ P+>++ L+ !E
> W+++(--) N+ !w---
> O- M++ V PS++(+++) PE- Y+(++) PGP>+++ t+(+++) 5++(+++)
> X++(+++) R+(+++)
> tv+(+++) b+(++++) DI+(++++) D+(++) G+(++++) e++>++++ h---
> r---(+++)* z(+++)
> 