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Re: Re: Tempest today
From: "Bipin Gautam" <gautam.bipin () gmail com>
Date: Sun, 20 Aug 2006 21:03:30 +0545

With double layered windows (double glazed), the ability to use
triangulation between laser TX and rx means it may be possible to capture
vibrations from the inner glass panel.

Infra-red absorbtive/scattering glass makes the most sense, or external
curtain materials, but we are int purpose built locations at this point.

a poor mans solution should be THE semi opaque glass we use in kitchen
that has those INCLINED trangular cut surfaces throughout while the
granular surface on the other side. Any light (though depends on the
wavelength) would bounce to the extreme right or left. Moreover,
without a small bug in the windows itself (say a prism) it would be
difficult to capture the reflected beem anyways. or yes as u
suggested, scattering glass.

a double layered window with distinct difference in refractive index
of  exterior & interior glass "might" be a better solution. I
experimented a simple solution. A 3v DC motor pressed in the glass
window to cause a small noise & glass vibration would almost
completely remove the chances for evasdroping. (but hey it was a
extermely simple amature solution to defeat my own amature equpment
anyways. Any coment on this, welcome!)


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