Secure attention key
Submitted by Thomas Hotz
Link to original bug (#699369)
Description
From Ubuntu bug: https://bugs.launchpad.net/ubuntu/+source/gdm/+bug/237721
In many environments computers are left unattended (e.g. schools, libraries, etc) and people can launch applications which mimic the look-and-feel of the login application (GDM) in order to get the users username and password.
This is called login spoofing.
Login spoofing can be prevented by using a secure attention key which is a key combination pressed before the user login to launch the password request dialog. This key can only be seen by the kernel, and not sniffed by any application.