クリプトス
CIA website on Kryptos
"CIA's Artistic Enigma Reveals All but Final Clues", June 16, 1999, New York Times
"Cracking the Code of a CIA Sculpture", July 19, 1999, Washington Post
"Gillogly Cracks CIA Art", & "The Kryptos Code Unmasked", 1999, New York Times and Cypherpunks archive
"Unlocking the secret of Kryptos", March 17, 2000, Sun Journal
"Solving the Enigma of Kryptos", January 26, 2005, Wired magazine, by Kim Zetter