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In this 2008 file photo, participants compete in the "Capture the Flag" hacking competition, a highlight of the DefCon conference in Las Vegas. After qualifying before the conference, teams battle to seize and keep control of a network set up for the game. (Associated Press)

In this 2008 file photo, participants compete in the "Capture the Flag" hacking competition, a highlight of the DefCon conference in Las Vegas. After qualifying before the conference, teams battle to seize and keep control of a network set up for the game. (Associated Press)

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