In addition to burglary, the covert means might include the installation of keystroke logging or trojan horse software or hardware installed on (or near to) target computers or ancillary devices. It is even possible to monitor the electromagnetic emissions of computer displays or keyboards from a distance of 20 metres (or more), and thereby decode what has been typed.
In addition to burglary, covert methods could involve the installation of keyloggers or trojans on target computers or nearby devices. It is also possible to monitor electromagnetic emissions from computer displays or keyboards at a distance of 20 meters (or more), and thereby decipher what has been typed.