Hackers at the DefCon conference were demonstrating these and other novel techniques for infiltrating facilities...
Want to break into the computer network in an ultra-secure building? Ship a hacked iPhone there to a nonexistent employee and hope the device sits in the mailroom, scanning for nearby wireless connections. (which makes our 24/7 rogue cellphone and wifi location service all the more valuable to you)
How about stealing someone's computer passwords? Forget trying to fool the person into downloading a malicious program that logs keystrokes. A tiny microphone hidden near the keyboard could do the same thing, since each keystroke emits slightly different sounds that can be used to reconstruct the words the target is typing.
As technology gets cheaper and more powerful, from cellphones that act as personal computers to minuscule digital bugging devices, it's enabling a new wave of clever attacks that, if pulled off properly, can be as effective and less risky for thieves than traditional computer-intrusion tactics. (more)