Introduction to securing Linux

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Only the paranoid survive, and that is no less true when securing Linux® systems as any other. Fortunately, a host of security features are built into the kernel, are packaged with one of the many Linux distributions, or are available separately as open source applications. The first in a series, this article starts you on your way to understanding security concepts and potential threats, and sets the stage for what you really need to know: how to secure and harden a Linux-based installation.

Link: Net-Security.org