Schneier on Security: Melbourne Water-Supply Security Risk
Another interesing piece, on SCADA security, from Bruce Schneier's blog. It's a good example of unintended consequences. When SCADA systems were designed it looks like most weren't expected to ever be connected to a general corporate network (let alone the Internet) and as such rarely had the kind of security built in that you would expect from systems controlling critical infrastructure pieces.
There's some interesting commentary on this piece as well and some good links on SCADA security....


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