A Bit About Security - Brief discussion on what to check to ensure Linux system security, by Marcus Berglund, Linux Gazette January 1998.
Creating a Linux Firewall - explains very thoroughly how to build your own `bastion host' firewall with Linux using the Trusted Information Systems (TIS) Firewall Toolkit, by Benjamin Ewy, Linux Journal May 1996.
Linux Security 101 - Introductory tutorial on securing a Linux system, with information on securing tcpd, by Kelley Spoon, Linux Gazette February 1997.
More Linux Security - An introductory article on Linux security, by Andrew Berkheimer, Linux Gazette April 1997.
