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They are designed to work with PS/2 keyboards, and more recently with USB keyboards.

Hardware keyloggers have an advantage over Software Keylogger s as they begin logging from the moment a computer is turned on (and are therefore able to collect a BIOS password for instance), and do not require software installation (unlike software solutions).


HOW DO THEY 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, even when power is lost


On the whole the recorded data is retrieved by typing a special password into a computer text editor. As the hardware keylogger is plugged in-between the keyboard and computer, it detects the password has been typed and then starts presenting the computer with "typed" data to produce a menu. Beyond text menu some keyloggers offer a high-speed download to speed up retrieval of stored data, this can be via USB mass-storage enumeration or with a USB or serial download adapter.