I'd rather have a bottle in front of me - than a frontal lobotomy"
SWISS BOFFINS at the Security and Cryptography Laboratory have managed to eavesdrop on 11 wired keyboards.
The technique works on keyboards ranging from the latest ones to the museum pieces used in 2001.
Basically the boffins found that modern keyboards generate electromagnetic emanations that can be used to decipher the keystrokes remotely.
Using basic instruments, they sniffed these electromagnetic signals, which eventually helped them to decipher the keystrokes typed.
Using a wireless aerial, keystrokes were sniffed from a computer located a few feet away.
However if you use a bigger antenna you can read someone's computer from 20 to 30 feet away.
Electromagnetic eavesdropping first appeared in the 1980s but lately there was a belief that modern keyboards prevent such attacks. Apparently not. ยต
L'Inq
Psyorg
This is very old news if one digs into the history of the Tempest Security specification.
We shouldn't forget that the bus speed of a computer can be the frequency at which it broadcasts. A poorly shielded machine can have its video card output and system bus output captured in say for instance an unmarked van parked near your house. Thus allowing the persons doing the eavesdropping to see your full screen and any data coming across the bus (like what you're typing or clicking on with your mouse).

'They' have been able to do that for a long time