Epic Fail - How OPM Hackers Tapped the Motherlode of Espionage Data

"The two systems breached were the Electronic Official Personnel Folder (eOPF) system, an entity hosted for OPM at the Department of the Interior's shared service data center, and the central database behind EPIC, the suite of software used by OPM's Federal Investigative Service in order to collect data for government employee and contractor background investigations."