Hardware keyloggers are devices that capture and record computer user keystrokes. These devices are plugged between the keyboard and the computer and store all keys typed in an internal memory. They are designed to work with both with PS/2 and USB keyboards. Take a look below to see how a hardware keylogger connects to the computer and 2 keylogger models, one for PS/2 keyboard and one for a USB keyboard.

Hardware keyloggers have an advantage over software keyloggers as they begin logging from the moment a computer is turned on (BIOS and login passwords can be captured) and also do not require software setup.

How does a hardware keylogger work

All hardware keyloggers have to have the following:

• A microcontroller - this interprets the datastream between the keyboard and computer, processes it, and passes it to the non-volatile memory
• A non-volatile memory device, such as Flash - this stores the recorded data, retaining it even when power is lost

Retrieving Recorded Keystrokes

1. When you want to see what your keylogger has recorded simply open Notepad or any other text editing program on your computer.
2. In a new document, you have to type in a password (take a look to the user guide)
3. After the password is typed correctly you are displayed a menu. The menu gives you the option to play back the recorded keystrokes. The keystrokes will appear in the document right before your eyes!

Source: Wikipedia

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