John Bumgarner, a cyber warfare expert who is chief technology officer of the U.S. Cyber Consequences Unit, a non-profit group that studies the impact of cyber threats, works on his laptop computer during a portrait session in Charlotte, North Carolina December 1, 2011. A cyber warfare expert claims he has linked the Stuxnet computer virus that attacked Iran's nuclear program in 2010 to Conficker, a mysterious worm that surfaced in late 2008 and infected millions of PCs. Conficker was used to open back door

US Withholds Evidence for Iran Cyberattacks

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John Bumgarner, a cyber warfare expert who is chief technology officer of the U.S. Cyber Consequences Unit, a non-profit group that studies the impact of cyber threats, works on his laptop computer during a portrait session in Charlotte, North Carolina December 1, 2011. A cyber warfare expert claims he has linked the Stuxnet computer virus that attacked Iran's nuclear program in 2010 to Conficker, a mysterious worm that surfaced in late 2008 and infected millions of PCs. Conficker was used to open back door

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