Who was behind the attack also remains a mystery . A Senate panel hears testimony about a new computer worm . The U.S. government has been warned that the Stuxnet virus is spreading to computers around the world. The Department of Homeland Security 's cybersecurity chief calls it a `` game changer ''
A Senate panel hears testimony about a new computer worm . The U.S. government has been warned that the Stuxnet virus is spreading to computers around the world. The Department of Homeland Security 's cybersecurity chief calls it a `` game changer ''