Security is paramount.  Security involves defense in depth. Approaching security one step at a time, with consistency and rigour, you can mitigate threats, and keep intruders at bay.

Intruders use a variety of different techniques in an attempt to compromise a system. For example, systems can be attacked by denial of service, cracking, intrusion, snooping (intercepting the data of another user), or viruses/worms/Trojan horses.  To have a secure box, a system therefore needs a variety of defenses.

The aim of this article is to provide the user with a starting point for improving the security of a Linux machine.  Basic system security (e.g. having a regular backup strategy, using hard-to-guess passwords, removing services that you don't need) is essential administration in protecting your data.  But you need a more sophisticated approach to keep intruders out.  

We have identified 80 of the best Linux security applications which help to protect the integrity of a system. For each application we have compiled its own portal page, providing a detailed description of the software, its features, with links to other relevant resources.

All of the software featured in this article is free to download, and almost all released under the GNU General Public License.  

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