Defense Secretary Seeks Support from Silicon Valley

President Obama’s newly installed defense secretary, Ashton B. Carter, toured Silicon Valley to announce a new military strategy for computer conflict, starting the latest Pentagon effort to invest in promising start-ups and to meet with engineers whose talent he declared the Pentagon desperately needed in fending off the nation’s adversaries. Mr. Carter immediately acknowledged, though, the need to rebuild trust with Silicon Valley, whose mainstays — like Apple, Google and Facebook (whose new headquarters he toured) have spent two years demonstrating to customers around the world that they are rolling out encryption technologies to defeat surveillance.