From Fedora Project Wiki
< Software
LUKS - Linux Unified Key Setup
This software is brand new for Fedora Core 5, having made it just in time .
LUKS provides hard disk encryption. This is a very important component in system security, as it provides one of the best physical security solutions -- protection of your data if your hard disk falls into the wrong hands.
You can read all about the software and project at:
http://code.google.com/p/cryptsetup/