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 latest release, which updates the base kernel to 2.6.3 and 2.4.24, contains numerous significant improvements to security in the open source operating system. 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.

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