A National Security Agency employee resigned from the agency after admitting to federal investigators that he gave former NSA analyst Edward Snowden a digital key that allowed him to gain access to classified materials, the NSA has told Congress. Snowden has previously said he did not steal any passwords.

The unnamed civilian employee who worked with Snowden resigned last month after the government revoked his security clearance, according to a letter that NSA legislative director Ethan L. Bauman sent this week to the House Judiciary Committee. A military employee and a private contractor also lost their access to NSA data as part of the continuing investigation by the FBI, Bauman said.