5 links
A Bit About Security
linuxgazette.net
Brief discussion on what to check to ensure Linux system security, by Marcus Berglund, Linux Gazette January 1998.
Adding Security to Common Linux Distributions
linuxfocus.org
Discusses ways Linux system administrators can secure a system from intruders, by Michael Jastremski, LinuxFocus July 1998.
Linux Security 101
linuxgazette.net
Introductory tutorial on securing a Linux system, with information on securing tcpd, by Kelley Spoon, Linux Gazette February 1997.
More Linux Security
linuxgazette.net
An introductory article on Linux security, by Andrew Berkheimer, Linux Gazette April 1997.
Securing Your Linux Box
linuxgazette.net
Introduction to securing a Linux box, by Peter Vertes, Linux Gazette November 1998.