Do-it-Yourself Hardware Keyloggers

Do you want to build a hardware keylogger yourself? Here is a collection of free tutorials.

If you have written a free guide yourself (or if you know of a HOWTO not linked here), please submit a new entry.

DIY Keylogger	DIY hardware keylogger. This guide presents the prototype version of a PS/2 hardware keylogger with full documentation, hardware electrical schematics, and firmware.
Hardware Decoder	Do you wonder how, exactly hardware keyloggers work? Here is hardware decoder to do a little investigation.
JitterBug	JitterBugs Could Turn Your Keyboard Against You, Steal Data.