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.

Grendel Scan version 1.0, a Web application testing tools, was introduced at the Defcon Security Conference in Las Vegas.

Journalists at the 2008 Olympic Games in Beijing will not have unfettered access to the Internet. However, GPL software OpenVPN can be used to easily circumvent such censorship.

You don't need expensive proprietary tools to practice the craft of computer forensics.

A forensics expert explains how to extract interesting details from a confiscated Windows hard disk using standard Linux tools.

Sometimes the best way to keep spam out of your mailbox is to keep the spammers from getting your address.

The BackTrack live distribution lets you act like an intruder to test your network’s security.

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