Julia Parsons knows how to keep a secret. She was tight-lipped about one for more than 50 years. Parsons, 100, of Forest Hills, was a code-breaker in World War II. She served in the U.S. Navy’s WAVES (Women Accepted for Volunteer Emergency Service). She worked on one of the first computers to decode German U-boat message traffic sent via the Enigma machine. Parsons finally broke her silence in 1997, the year she discovered that the information was declassified in the 1960s. That’s when she told her husband Don, a U.S. Army veteran, whom she met in the service. They were married for 62 years. He died when he was 82. They had three children.