US struggles to pinpoint cyber attacks: Top official

The United States often cannot quickly or reliably trace a cyber attack back to its source, even as rival nations and extremists may be looking to wage virtual war, a top official warned Tuesday.

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<p><a href="http://www.physorg.com/news155937581.html">US struggles to pinpoint cyber attacks: Top official</a></p> <p>The United States often cannot quickly or reliably trace a cyber attack back to its source, even as rival nations and extremists may be looking to wage virtual war, a top official warned Tuesday.</p>