'Demonically Clever' Backdoor Hides Inside Computer Chip
I'm still waiting for someone - say Raytheon, General Dynamics, Northrop Grumman or Boeing - to find that those SMD capacitors or inductors they used for their hardware ended up being more than just simple passive components. The amount of space available in the package is more than enough to hide some circuitry which can be used for other purposes ranging from bridging air gaps to denial of service. These parts are used in positions where ample power is available for such purposes. The device could be triggered by outside signals, by specifically crafted power profiles, by simple timers or other means. They could be designed to detect the location where they're used in the circuitry and act accordingly.