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Re: [PLUG] EMI shielding on the power line
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On Tue, Jul 14, 2009 at 03:17:30PM -0400, TuskenTower wrote:
> I happened to see this sensationalist piece about eavesdropping
> keystrokes over the ground power line.
> http://news.bbc.co.uk/2/hi/technology/8147534.stm
>
> I was wondering if powering a computer with a UPS or a power line
> conditioner would eliminate this problem. How would something like
> this affect a laptop or anything with a transformer in the middle. My
> knowledge of electronics involved is minimal, which is why I'm asking.
>
> Amul
I think you can take off the tin foil hat. :-) This was done with a PS/2
keyboard. The electronics in USB are different enough that, if the
attack could still work, it would need to be largely re-engineered.
Furthermore, as you suspect, anything that isolates the source current
from the computer circuitry in some way (UPS, power brick, etc) would
sharply decrease the fluctuations if not eliminate them all together.
-Randall
(but who would listen to a Chemical Engineer? :-)
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