Re: data diodes

From: Ronald Crane <voting_at_lastland_dot_net>
Date: Mon Dec 04 2006 - 12:49:59 CST

On Mon, 4 Dec 2006 04:02:34 -0800, Arthur Keller wrote
> At 3:44 AM -0800 12/4/06, Ronald Crane wrote:
> >As for triggers, there's no reason that one can't broadcast them on the
> >powerlines or using radio, then embed the appropriate receiver in an ASIC.
> There are filters for DSL lines so that only a clean signal gets to
> an ordinary phone instrument. Are there filters for BPL (Broadband
> over Power Lines) so that they cannot pass, and only a clean 60 Hz
> wave gets through?
> There would seem to be a need for such devices for secure military
> installations, once the FCC's misguidedly approved BPL gets
> widespread.
> (I say misguided because BPL appears to interfere with ham radio.)

You could filter BPL signals (which are in the 80MHz range), but that wouldn't
necessarily be the end of it. Because parameterizing an attack (or even
sending whole malware programs) requires so few bits, an attacker has great
flexibility in choosing her frequency range and modulation type. It'd be real
work to filter them all (say with a sharp 60Hz notch filter). And that still
leaves radio, which requires a different set of countermeasures.

Then there are all the things people more clever than myself will come up with.

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Received on Sun Dec 31 23:17:05 2006

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