If you share a computer with a non trust person than you can find very easy what this person type. How? With a little help come from KeyPhantom.

The KeyPhantom(tm) USB Personal is a hardware device designed to record keystrokes from any USB keyboard. It looks like a USB extension cable, and can be installed in seconds.

The key features are:

Records USB traffic at a hardware level; device looks like a USB extension cable.
Installs in seconds.
Can be installed even if the computer is switched off.
Designed with the home user in mind.
128Kb of memory (approximately 2 weeks of keystrokes).
Works with any version of Windows, or Linux.
Keystrokes can be recorded on one computer, and retrieved on another.
Keystrokes are safe, even if the host computer experiences a hardware or operating system failure.

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