The U.S. National Security Agency (NSA), also known as the codemakers and codebreakers cryptologic division within the Department of Defense, has helped to harden Linux with newly-released Security Enhanced Linux (SELinux) kernel modifications.

The SELinux improvements mark a major breakthrough for Linux. Because of the NSA's contributions to the kernel, the new security features will now show up in mainstream distributions of Linux.

SELinux was released by the NSA under the GNU GPL open source license. SELinux is essentially a Linux Kernel with a number of utilities that provide enhanced security functionality. But the critical component of SELinux is how it implements and handles mandatory access controls.

http://www.nsa.gov/selinux/news.cfm

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