Also Sprach sunder:

2. If you protect the cable as well, they can use a keyboard capture program, or they can tempest detect your keystrokes.

Tempest works not on just the keyboard but the entire machine. Monitor, system unit, cables, and keyboard all give off tempest emissions. The usual way this is handled is to have the room the system(s) are in shielded, and or completely underground, or both. The Zenith "tempest" 286 PC had 72 screws and a very solid steel CPU casing, and it's cables were completely unshielded. Your tax dollars at work. D'oh! :) -- "You know you're a geek when you log onto IRC | Do not CD c so you can tell your friend halfway across the | taunt --------P===\==/ country which HTML hex code to use for the | happy fun /_\__ color of your wedding dress." -- Me | fencer! _\ \