The code warriors of the future literally might be computer code acting as warriors to defend against attackers on computer networks. The Defense Advanced Research Projects Agency, or DARPA, gave us a glimpse into that future last Sunday, when it announced the winners of its Cyber Grand Challenge at DEF CON. Seven teams participated in the challenge to create systems that used bots to find and fix software problems without human intervention. “Our mission is to change what’s possible,” said DARPA Director Arati Prabhakar.