Hardware Keylogger Detection

..........................................................................................................................4 Introduction .....................................................................................................................4 Hardware Keyloggers Overview ..........................................................................................4 Products Tested................................................................................................................4 How Does a PC Keyboard Work? .........................................................................................5 The Low Level Keyboard Command Set ...............................................................................5 How do Hardware Keyloggers Work? ...................................................................................8 DIY Keylogger Parts list .....................................................................................................9 Hardware Keylogger Detection .........................................................................................10 Command Responses Timing Issues? ................................................................................10 Emulating Keypresses .....................................................................................................10 The Authentication Mechanism and Menu System ...............................................................11 Default Passwords...........................................................................................................11 Changing the Keylogger Password ....................................................................................11 Hardware-based Password Reset Solutions ........................................................................12 Memory Limitations.........................................................................................................12 Keylogger Detection using Voltage or Current Measurement.................................................13 Keyboard Current Measurement .......................................................................................13 PC Voltage Measurement .................................................................................................14 References.....................................................................................................................16