“Michael H. Warfield gets you started with elementary Linux
security.”
“Are strange people accessing the data on your Linux box? Are
they using your machine to attack others? Unless you have a good
grasp of basic Linux security, they could well be doing this — if
not today, then in the near future…”
“The real intent of this two-part series is to help you improve
the security of your system and to get you to think securely. One
without the other is unlikely to succeed.”