This Linux computer on a USB stick acts as a tiny mobile firewall.

Instead of granting access by address, the NuFW Netfilter module provides identity-based authentication. The Edenwall firewall appliance comes with built-in NuFW technology.

A full-fledged Linux computer on a USB stick: Yoggie uses this astonishing hardware trick to protect Windows machines against Web-based attacks. But there are some things that do not work as intended by the developers as an exhaustive test in Linux Magazine #94 / September will reveal. Just a few simple tricks were all it took to work around the firewall.

We'll show you how the lessons learned in the 1980s movie "The Karate Kid" can be applied to securing your systems.

Kurt Seifried explains how you can safely play with your systems in the security of a sandbox.

Internet intruders have many ingenious ways of escalating privileges and hiding their presence once they get inside your system. The best protection is to keep them out in the cold.

Reviews of O'Reilly's Beautiful Code: Leading Programmers Explain How They Think, Prentice Hall's The Official Damn Small Linux Book, and Linux Firewalls: Attack Detection and Response with iptables, psad, and fwsnort from No Starch Press.

Spanish security researchers have discovered several vulnerabilities in the "Firewall-1" security solution by software vendor Checkpoint, and are now questioning its Common Criteria EAL4+ certification.