Timeline: How the Postal Service Data Breach Went Down

U.S. Postal Service officials are revealing more about the cyber intrusion at the agency that exposed the personal data of about 800,000 USPS employees.

Testifying before Congress Wednesday, Randy Miskanic, incident commander on the case and the USPS secure digital solutions vice president, laid out a nearly day-by-day timeline of the incident -- from the time the Department of Homeland Security first notified the agency of suspicious network activity to when postal officials first notified employees of the breach nearly two months later.

The USPS hack is one of many infiltrations of federal networks that occurred in September and October, including incidents at the National Oceanic and Atmospheric Administration, the White House and the State Department.

The timeline of events provides a fascinating look at how the federal government -- DHS, the FBI, the White House and agencies themselves -- responds to cyber intrusions.