Yahoo’s CISO resigned in 2015 over secret e-mail search tool ordered by feds

According to a new report by Reuters citing anonymous former employees, in 2015, Yahoo covertly built a secret “custom software program to search all of its customers’ incoming emails for specific information.”

Reuters noted that Yahoo “complied with a classified US government directive, scanning hundreds of millions of Yahoo Mail accounts at the behest of the National Security Agency or FBI, said two former employees and a third person apprised of the events.” It is not clear what data, if any, was handed over.