Iranian President Mahmoud Ahmadinejad (foreground) visits the Natanz Uranium Enrichment Facility some 200 miles south of the capital, Tehran, in this April 8, 2008, photo issued by the Iranian president's office. Iranian President's Office/AP hide caption

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President Obama talks about U.S. cybersecurity in May 2009. Obama has described U.S. computer networks as a "strategic national asset," and promised to "deter, prevent, detect and defend against" cyberattacks. Ron Edmonds/AP hide caption

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Director of National Intelligence Dennis Blair testifies before the House Intelligence Committee in February on the annual threats assessment of the U.S. intelligence community. Manuel Balce Ceneta/AP hide caption

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Every country that uses the euro as its currency has a stake in a successful financial outcome for Greece. Photo illustration by Sean Gallup/Getty Images hide caption

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