A Bit About Security
Brief discussion on what to check to ensure Linux system security, by Marcus Berglund, Linux Gazette January 1998.
Adding Security to Common Linux Distributions
Discusses ways Linux system administrators can secure a system from intruders, by Michael Jastremski, LinuxFocus July 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 Kernel 2.4 Firewalling Matures: netfilter
An interesting article that covers Linux 2.4 kernel firewalling code and the differences from the previous 2.2 ipchains code.
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.
Next Generation Kernel Security
Outlines the kernel security improvements that have been made in the 2.4 Linux kernel.
Replacing Telnet: OpenSSH, a secure alternative
A step-by-step guide to setting up and using OpenSSH instead of telnet on your Linux box.
Securing Linux, Part 1
First of a two parts article that discusses how to make a Linux installation secure, by Michael Warfield, Linux World May 1999.
Securing Your Linux Box
Introduction to securing a Linux box, by Peter Vertes, Linux Gazette November 1998.