Hacked data on millions of US gov't workers was unencrypted

 A union representing U.S. government workers says it believes detailed personal information on millions of current and former federal employees that was stolen by hackers was not encrypted.

The American Federation of Government Employees (AFGE) said the attack on the Office of Personnel Management (OPM) resulted in the theft of all personnel data for every federal employee.

In a letter sent Thursday to Katherine Archuleta, director of the OPM, from David Cox, president of the AFGE, the union says it believes hackers targeted the government's Central Personnel Data File, an expansive database with information on government workers except those in the military or intelligence fields. The OPM has acknowledged a breach affecting around 4 million people, but hasn't provided detailed information on what was stolen, how it was stored and how hackers managed to break into its system.