The next large-scale military or terrorist attack on the United States, if and when it happens, may not involve airplanes or bombs or even intruders breaching American borders.
Cyberattackers shut down one Georgian government site and defaced another with images of Adolf Hitler.

Instead, such an assault may be carried out in cyberspace by shadowy hackers half a world away. And Internet security experts believe that it could be just as devastating to the U.S.'s economy and infrastructure as a deadly bombing.

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