James Lyne, global head of security research at Sophos, 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, 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.