Personal data security

China and Russia are using hacked data to target U.S. spies, officials say

Counterintelligence officials say their adversaries combine those immense data files and then employ sophisticated software to try to isolate disparate clues that can be used to identify and track — or worse, blackmail and recruit — U.S. intelligence operatives.
Digital analysis can reveal "who is an intelligence officer, who travels where, when, who's got financial difficulties, who's got medical issues, [to] put together a common picture," William Evanina, the top counterintelligence official for the U.S. intelligence community, said in an interview.