Computer security is an ongoing process, a relentless contest between system administrators and intruders. Systems need to be monitored carefully and revised frequently.Rather than provide a total security solution for Linux computers, the authors of the Linux Security Cookbook have condensed this complex subject into a series of easy-to-follow recipes-short, focused pieces of code that administrators can use to improve security and perform common tasks securely. This guide includes real solutions to a wide range of targeted problems, such as sending encrypted email within Emacs, restricting access to network services at particular times of day, firewalling a webserver, preventing IP spoofing, setting up key-based SSH authentication, and much more. The Linux Security Cookbook gives administrators a way to close common security holes quickly without having to look up specific syntax. This book is a system saver.