CHAPTER 9How to Secure Your Computer

Linux is widely considered one of the most secure operating systems around. On a basic level, Linux is built from the ground up to be fundamentally sound, and it forces users to work with security in mind. For instance, it enforces the system of ordinary users who are limited in what they can do, thus making it harder for virus infections to occur.

In addition, Linux contains a firewall that is hard-wired into the kernel. It's called iptables (, and is considered among the best by practically all computer security experts. Not only that, but it can protect your home PC just as well as it can protect the most powerful supercomputer. But, as with many Linux kernel components, iptables is ...

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