] This article presents a new security system, termed port
] knocking, in which trusted users manipulate firewall
] rules by transmitting information across closed ports.

[ i'm nothing like a security professional, but i seem to recall that there are a few people on this site who are ;) Thoughts? Is this a useful extra layer of security or does the complexity it adds to your firewall negate that?
it seems pretty damn smart to me, insofar as one more level of effort required to crack something is one level more than some people will be able to put forth. but then, again, i don't make a living either securing or cracking networks or systems, so... -k]

Port Knocking