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Operators of America's vital power, water and manufacturing facilities use industrial control systems (ICS) to manage them, and the security of these systems, increasingly linked with Microsoft Windows and the Internet, is now under intense scrutiny because of growing awareness that they could be attacked and cause massive disruptions.

The idea that any number of federal institutions are watching your every move on social networks like Facebook, Twitter is unnerving at best. The Department of Homeland Security is one of those agencies and today it testified before a House subcommittee to define and defend its role in social media monitoring.

The U.S. Department of Homeland Security is engaging in media monitoring activity that achieves no public safety goals and will likely have a chilling effect on legitimate criticism of the agency, a leading privacy advocacy group warned.

YouHaveDownloaded crawls BitTorrent sites, recording IP addresses of those downloading files and the files they're downloading. It turns out, if the record is correct, that two of the most energetic persecutors of downloaders are illegal downloaders themselves.

A tour of ICS-CERT facilities at Idaho National Labs. Meet the people who will get the call when the next Stuxnet worm strikes.

A document purportedly leaked form the FBI's criminal-profiling unit calls Anonymous not a collection of activists , but a unified criminal group focused on protest and social disruption.

The U.S. Department of Homeland Security today issued a somewhat unusual bulletin warning the security community about the planned activities of hacking collective Anonymous over the next few months.

A top Homeland Security Official admitted to Congress that electronics and software sold in the United States are sometimes preloaded with spyware, malware, and other nasty security-compromising components by unknown foreign parties.

In 1995, the subway system in Tokyo was the target of a domestic terrorism attack involving a potent gas called sarin, a chemical weapon that can cause neurological damage and even death. In five coordinated incidents, members of a radical-religious group known as Aum Shinrikyo released the sarin gas on five trains in the Tokyo subway system. The attack killed 12 commuters, seriously injured 54 and affected 980 more who experienced some health effect. The lesson learned in the tragedy was that chemical agents have the potential do widespread damage -- and a subway system provides an ideal environment for dangerous gas to travel fast.

The close call Monday night in which a suspected terrorist nearly took off on a plane to Dubai after a botched bombing attempt in New York City has led the Transportation Security Administration to tighten procedures for checking passengers against the U.S. government's No Fly List.

The U.S. Department of Homeland Security is looking to Internet users for new ways of getting its cybersecurity message out, and before you ask, the agency says that the method chosen "may under no circumstance create spam."

Michael Chertoff, former head of the U.S. Department of Homeland Security, talked of the difficulties in creating a national cybersucurity plan during an interview with Computerworld.