How the NSA took Linux to the next level
You know SELinux is built to be virtually attack-proof, but do you know how the National Security Agency (NSA) accomplish it? Take a closer look at the SELinux kernel architecture, why this is important, and what makes SELinux one of the most secure implementations of Linux available.
http://www.ibm.com/developerworks/linux/library/l-selinux/?ca=dgr-btw01SELinux