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James Lyne, global head of security research at Sophos, displays a GPS device as he prepares to go "war biking" in Las Vegas Monday, May 5, 2014. His bicycle is equipped with a scanner and computer that can detect Wi-Fi networks.

Steve Marcus

James Lyne, global head of security research at Sophos, displays a GPS device as he prepares to go "war biking" in Las Vegas Monday, May 5, 2014. His bicycle is equipped with a scanner and computer that can detect Wi-Fi networks.