KeyLogger1 Office KeyLogger 1.2

Keystroke logging can be achieved by both hardware and software means. Hardware key loggers are commercially available devices which come in three types: inline devices that are attached to the keyboard cable, devices which can be installed inside standard keyboards, and actual replacement keyboards that contain the key logger already built-in. The inline devices have the advantage of being able to be installed instantly. However, while they may go unnoticed for quite some time, they are easily detected visually upon closer inspection. Of the three devices available, the most difficult to install is also the most difficult to detect. The device that installs inside a keyboard (presumably the keyboard the target has been using all along) requires soldering skill and extended access to the keyboard to be modified. However, once in place, this type of device is virtually undetectable unless specifically looked for.

They also have a legitimate use, that is, they are used to study how users interact with software.