An anonymous reader writes "It's a given that hackers will target software, and that's enough for many people to worry about. But now there's the possibility that hackers would hide malicious code in the hardware itself. A hardware hack could be an annoyance, by stopping a mobile phone from functioning. Or it could be more dangerous, if it damages the way a critical system operates. Villasenor says there are several types of attacks. Broadly they would fall into two categories: one is when a block stops a chip from functioning, while the other involves shipping data out."