In this image made from video released by WikiLeaks on Friday, Oct. 11, 2013, former National Security Agency systems analyst Edward Snowden speaks during a presentation ceremony for the Sam Adams Award in Moscow, Russia. Should Snowden ever return to the U.S., he would face criminal charges for leaking information about NSA surveillance programs. But legal experts say a trial could expose more classified information as his lawyers try to build a case in an open court that the operations he exposed were illegal.  (AP Photo)

NSA: Co-worker provided a digital key to Snowden

A National Security Agency employee resigned from the agency after admitting to federal investigators that he gave former National Security Agency analyst Edward Snowden a digital key that allowed him to gain access to classified materials…