Netfilter’s Recent module builds a temporary blacklist to keep intruders off your network.

If you know your way around network protocols, you can get to the source of a problem quickly with Wireshark.

Protect your system and preserve your configuration with this powerful backup tool.

Is your address book open to the world? Is your mobile phone calling Russia? Many users don’t know how easy it is for an attacker to target Bluetooth.

Study your network’s defenses with the Ubuntu-based nUbuntu security testing distribution.

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.

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.