An excellent example of this is in our firewall and VPN technologies today.

FORBES: Teach Your Boss to Speak Security: Economy of Mechanism

The hacker doesn't even need to be in the same ZIP code to crack a firewall or VPN -- the 3G link lets the Power Pwn take bash command-line instructions through SMS messages and doles out some of its feedback the same way.

ENGADGET: DARPA-backed Power Pwn is power strip by day, superhero hack machine by night

Most firewall vendors include a VPN application as a part of the firewall itself.

FORBES: Teach Your Boss to Speak Security: Economy of Mechanism