Spotting a Keylogger in Public Access Computers

A couple of librarian blogs (see posts at the Swiss Army Librarian and have recently pointed to this story about a library in England where a couple of USB devices were found plugged into public access computers. Those devices were keyloggers that were able to record every single keystroke. Unlike a USB memory drive that stands by itself in a USB port, these keylogger devices also had the keyboard plugged into them. I suppose we should keep an eye out for anything unusual we see plugged into computers.