ABC News: ...to see once and for all if they're responsible for the massive breach at the Democratic National Committee, according to three former senior intelligence officials. It's a job that the current head of the NSA's elite hacking unit said they've been called on to do many times before. By Lee Ferran
'Robert Joyce, chief of the NSA's shadowy Tailored Access Operations, declined to comment on the DNC hack specifically, but said in general that the NSA has technical capabilities and legal authorities that allow the agency to "hack back" suspected hacking groups, infiltrating their systems to gather intelligence about their operations in the wake of a cyber attack.
'"In terms of the foreign intelligence mission, one of the things we have to do is try to understand who did a breach, who is responsible for a breach," Joyce told ABC News in a rare interview this week. "So we will use the NSA's authorities to pursue foreign intelligence to try to get back into that collection, to understand who did it and get the attribution. That's hard work, but that's one of the responsibilities we have."'