Linux is both more secure and less common than Windows based systems with the consequence that attacks on Linux systems occur less frequently than on Windows systems. Having said that it would be foolish to be complacent about securing any system regardless of whether it runs Windows, Linux or any other operating system.
The purpose of this book is to provide a step by step approach to securing a Linux system from outside attack. It is designed to be used and understood by both new and experienced Linux users.
Link: http://www.linuxtopia.org/LinuxSecurity/index.html
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