Linux Security Technology Security of a system is important in our today’s use of the internet. That is why Linux with its many layers that are always evolving in security to protect against all kinds of hackers or othe types of attacks . SELinux, Chroot Jail, IPTables, Mandatory Access Control and Discrestionary Access Control, just to name a few. SELinux is an access control implementation for the Linux kernel. Take for instants that you are the administrator and you define rules in user space and if the Linux kernel has been added with SELinux support, then those rules will be followed by the kernel. SELinux is a NSA Security-Enhanced Linux, in which the mandatory access control is flexible. The structure of SELinux supports against all kinds of mandatory access control policies. Some of which are Role-Based Access Control and Multi-Level Security. It was designed by NSA for the purpose of protecting a server against malicious daemons, by telling the daemons what they can and can’t do. This type of technology was created by Secure Computing Corporation, but was supported by the U.S. National Security Agency. In 1992, the thought for a more intense security system was needed and a project called Distributed Trusted Match was created. Some good solutions evolved from this, some of which were a part of the Fluke operating system. Which then became the Flux and finally led to the creation of the Flask architecture. Eventually it was combined with the Linux kernel, which created another project called SELinux. Since NSA realized that the Linux operation system did not have any security that would enforce access control and the information on what it should require to be consisant. NSA didn’t just happen to choose Linux by accident, the system is an open sourced system which can be changed to create whatever the need may be. SELinux wasn’t created to solve