U.S. Officials Struggle with Response to Political Cyber Attacks

The recent revelations of hacking into Democratic campaign computer systems in an apparent attempt to manipulate the 2016 election is forcing the White House to confront a new question: whether, and if so how, to retaliate. Even if officials gather the proof, they may not be able to make their evidence public without tipping off Russia, or its proxies in cyberspace, about how deeply the National Security Agency has penetrated that country’s networks.