Security Enhanced Linux, a project of the National Security Agency (NSA), is an add-on to Linux which provides fine-grained access control. It provides tools for ensuring that only authorized users and programs can make changes to your system. It is part of Fedora Core 2, CentOS4, RHEL 4 and later versions of all of those distributions, and is available in KRUD Linux and in KRUDserver Linux. Tags: Linux, SysAdmin, Security