Patrick T. Lane & James Stanger 
Hack Proofing Linux [PDF ebook] 
A Guide to Open Source Security

From the authors of the bestselling E-Mail Virus Protection Handbook! The Linux operating system continues to gain market share based largely on its reputation as being the most secure operating system available. The challenge faced by system administrators installing Linux is that it is secure only if installed and configured properly, constantly and meticulously updated, and carefully integrated with a wide variety of Open Source security tools. The fact that Linux source code is readily available to every hacker means that system administrators must continually learn security and anti-hacker techniques. Hack Proofing Linux will provide system administrators with all of the techniques necessary to properly configure and maintain Linux systems and counter malicious attacks. – Linux operating systems and Open Source security tools are incredibly powerful, complex, and notoriously under-documented – this book addresses a real need- Uses forensics-based analysis to give the reader an insight to the mind of a hacker