USB-Key based screen locking for linux. Kind of inspired by rohos for windows, but does not require a specific device - any USB device with a unique serial number will work.
Unlocking should work on any freedesktop compatible screenlocker that supports a dbus call to org.freedesktop.ScreenSaver.SetActive, with a special exception for KDE 4.10 onwards which decided to just break compatability... (See: https://bugs.kde.org/show_bug.cgi?id=314989)
If it doesn't work, feel free to raise an issue about it and/or a pull request to fix it.
Insert your usb device of choice and run ./screenlocker.sh -s to set it up.
Once set up, insert and remove your key!
If you pass a -u parameter to the setup then ALL usb devices will be checked rather than just devices that are "known good"
You can also pass -k <keyfile> to allow setting up multiple unlock keys
See: https://github.com/ShaneMcC/screenlocker/issues
This is a pretty simple script, so there shouldn't really be much in the way of bugs.