Elonka Dunin is an American video-game developer and cryptologist. Bestselling author Dan Brown named Nola Kaye, a character in his novel, The Lost Symbol, after her. Elonka has published a book of exercises on classical cryptography and maintains cryptography-related websites about topics such as the world’s most famous unsolved codes and Kryptos, a sculpture at the Central Intelligence Agency containing an encrypted message. She is considered the leading Kryptos expert in the world. Elonka is a member of the United States National Cryptologic Museum Foundation’s Board and frequently gives lectures on the subject of cryptography.