Elonka Dunin is a crypto expert and co-leader of a group that is working to crack the final cipher on the Kryptos sculpture at CIA Headquarters. She maintains a website of the World’s most famous unsolved codes, and bestselling author Dan Brown named his character “Nola Kaye”, a scrambled form of “Elonka”, in his novel The Lost Symbol, after her. Elonka was a member of the Board of Directors for the National Cryptologic Museum Foundation, and General Manager and Executive Producer at Simutronics, making award-winning online and mobile games. In 2006, Elonka published The Mammoth Book of Secret Codes and Cryptograms, and with Klaus she co-wrote the book Codebreaking: A Practical Guide, with editions in 2020 and 2023.