In January, the hacker group Anonymous staged a demonstration at a BART station in San Francisco after officials turned off cell phone service in its stations.
Justin Sullivan/Getty Images
April 5, 2012 Powerful and potentially damaging tools, including those that take advantage of communications networks, have become much more widely spread. They could be used to disrupt everything from factory valves to chips used to track cattle.
Symantec's pcAnywhere program.
February 7, 2012 The hackers, which claimed affiliation with Anonymous, made good on their promise to release the source code for the company's PCAnywhere program, which allows a user to access their computers remotely.
The Greek Ministry of Justice website after it was hacked earlier today.
Louisa Gouliamaki /AFP/Getty Images
February 3, 2012 A day that began with the Anonymous hackers posting a 17-minute recording of a call between officials of the FBI and Scotland Yard has been followed with some tweeted taunting and the hacking of websites for the Greek government and Boston Police.
The Guy Fawkes mask has come to symbolize the group Anonymous. This mask was seen during protest in Germany.
Sean Gallup/Getty Images
December 27, 2011 A security firm sifting through the stolen data said it found 50,000 credit card numbers, 27,000 phone numbers and 44,000 passwords.
December 10, 2010 Are online denial of service attacks by WikiLeaks' supporters the modern-day equivalent of the physical, non-violent protests of civil rights and labor rights activists in years past?
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