How OPM hackers tapped the mother lode of espionage data

Government officials have been vague in their testimony about the data breaches—there was apparently more than one—at the Office of Personnel Management. But on Thursday, officials from OPM, the Department of Homeland Security, and the Department of the Interior revealed new information that indicates at least two separate systems were compromised by attackers within OPM’s and Interior’s networks. The first was the Electronic Official Personnel Folder (eOPF) system, an entity hosted for OPM at the Department of the Interior’s shared service data center.