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Up until quite recently, a Macintosh user was able to remain mostly free from harmful worms and viruses on their computers This is partially because of the fact that as Mac OS X is Unix-based, the operating system is relatively secure against such attacks

iptables is a tool used in linux distributions to control kernel's netfilter's firewall. Here is a tutorial on iptables.IPtables firewall contains 3 tables, every table contains chains. Those chains are default. User is able tdefine new chains and link from default chains to those user defined chains.

Sometimes you need to encrypt your home (and maybe swap) partition so it will not be available until you input a password and/or use a key. This tutorial is about encrypting a FreeBSD Home Partition using GELI.

A rootkit is a program designed to take fundamental control of a computer system, without authorization by the system’s owners and legitimate managers. Most rootkits use the power of the kernel to hide themselves, they are only visible from within the kernel. How do I detect rootkits under CentOS or Debian Linux server?

General advices regarding security of a Linux, FreeBSD, OpenBSD, NetBSD and generaly Unix. Linux is more vulnerable because some distros have activated many services in default installation so you must disable services you do not need.

Recently, I have been watching a lot of my friends who use various versions of Windows getting a lot of viruses, mostly because of their negligence/ignorance. This sudden spurt in spread of Viruses/Worms/Trojans etc. made me think about Linux security. It also made me realize how vast this topic of "Securing a Linux Box" can be.

The pervasiveness of the Internet has led to more and more opportunities for your company's servers to be attacked from without. Part-time Linux admins, never fear. Our updated network security basics document will get you well on your way to locking your system down.

One of the most powerful aspects of Linux is its ability to launch services, or daemons, and run them in the background as needed. But running all of these background services can be an administrative headache when you take into account user access and permissions, too. Dee-Ann LeBlanc walks readers through the basics of xinetd, a tool that lets you securely and effectively lock down services on your Linux machine.

When you're running an Apache Web server for yourself, you don't think about the user that's running the Apache server itself (typically nobody on Linux systems). But what if you're an ISP with multiple companies being hosted on your system? Or an educational institution with faculty who want to be able to execute their own scripts? Either everything has to be accessible to the Apache nobody user, or you have to run multiple instances of Apache on multiple ports and IP addresses, one of each per user, with the concomitant confusion of configuration files. The solution is the use of the suexec wrapper, which is part of the Apache distribution.

If you know linux you should have basic knowledge of the command line. If you don't this tutorial will help you out.

Want to keep your MP3s away from your boss’ or big brother’s view? Of course, in Linux anything that starts with a period is “suppose” to be hidden; but all we have to do is type “ls -A” or turn on the viewing of hidden files in KDE…not too hard. Basically what we can do is set a transparent PNG as our folder icon, and rename our folder with a ” “(space). This will actually keep the previous name of the folder.Also we will keep anyone out of the folder that doesn’t know Linux commands, and doesn’t know exactly where we have placed the icon. This works GREAT for the desktop.

Protect your server from SSH attacks with this step-by-step guide. This guide shows you how to move your SSH port, install brute force detection, and more!

SCENARIO: A friend of mine had a problem, he has a home network similar to mine and a Wireless Access Point (AP) that he wanted to use since mobility is everything. We sat down and designed his network and then wrote an iptables script for his setup.What follows is a more or less picture so you get the idea what the system / network looked like:

This is a beginners' guide. Things are explained very simply here but it WILL give you a good understanding what iptables is and how to begin writing a script. Sure you can do this all with a GUI but, wouldn't you like to know how to do it down and dirty?

This tutorial shows some effective methods to help prevent SSH attacks.

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