First real-world SCADA attack in US
Jay Ashworth
jra at baylink.com
Tue Nov 22 15:16:56 UTC 2011
----- Original Message -----
> From: "Brett Frankenberger" <rbf+nanog at panix.com>
> The typical implementation in a modern controller is to have a separate
> conflict monitor unit that will detect when conflicting greens (for
> example) are displayed, and trigger a (also separate) flasher unit that
> will cause the signal to display a flashing red in all directions
> (sometimes flashing yellow for one higher volume route).
>
> So the controller would output conflicting greens if it failed or was
> misprogrammed, but the conflict monitor would detect that and restore
> the signal to a safe (albeit flashing, rather than normal operation)
> state.
"... assuming the *conflict monitor* hasn't itself failed."
There, FTFY.
Moron designers.
Cheers,
-- jra
--
Jay R. Ashworth Baylink jra at baylink.com
Designer The Things I Think RFC 2100
Ashworth & Associates http://baylink.pitas.com 2000 Land Rover DII
St Petersburg FL USA http://photo.imageinc.us +1 727 647 1274
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