xsecurelock - 1.9.0-1+b1 main

Screen lock utilities are widespread. However, in the past they often had
security issues regarding authentication bypass (a crashing screen locker
would unlock the screen), information disclosure (notifications may appear on
top of the screen saver), or sometimes even worse.
.
In XSecureLock, security is achieved using a modular design to avoid the usual
pitfalls of screen locking utility design on X11.