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.

There are several types of hardware keyloggers that you should be aware about:

1) Regular Hardware Keyloggers – are used for keystroke logging by means of a hardware circuit that is attached somewhere in between the computer keyboard and the computer. It logs all keyboard activity to its internal memory which can be accessed by typing in a series of pre-defined characters. A hardware keylogger has an advantage over a software solution; because it is not dependent on the computers operating system it will not interfere with any program running on the target machine and hence cannot be detected by any software.

2) Remote Access Hardware Keyloggers – Or otherwise know as Wireless Hardware Keyloggers work in much the same way as regular hardware keyloggers. Except they have the ability to be controlled and monitored remotely by means of a wireless communication standard.

3) Wireless Keylogger sniffers – Collect packets of data being transferred from a wireless keyboard and its receiver and then attempts to crack the encryption key being used to secure wireless communications between the two devices.

Source: Wikipedia

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