Conventional, woodpecker-style port knocking is open to sniffing and brute force knocking attacks. Sending an encrypted packet with an access request to the server is safer and more modern. Learn more about Firewall Knock Operator, a.k.a. Fwknop.

Tailbeep is a simple administration tool that sends an audible beep when it finds a specified search string in a log file. Version 0.45 now includes an interface to the Festival speech synthesis framework.

You need to think like an attacker to keep your network safe. We asked security columnist Kurt Seifried for an inside look at the art of intrusion.

A botnet named psyb0t has been nesting for a few months in consumer devices that run on Linux with MIPS CPUs, notably routers. Infested devices connect through a botnet over a private Internet Relay Chat (IRC) server to await commands.

You need to think like an attacker to keep your network safe. We asked security columnist Kurt Seifried for an inside look at the art of intrusion.

A new feature in Fedora 12 was that users could install RPM packages from signed repositories without a root password. "Not good," said many users, so the project decided to reverse the policy.