[2] Dunin has published a book of exercises on classical cryptography, and maintains cryptography-related websites about topics such as Kryptos, a sculpture at the Central Intelligence Agency containing an encrypted message,[1][4][5][6] and another on the world's most famous unsolved codes.

[7] She has given several lectures on the subject of cryptography,[8][9] and according to the PBS series NOVA scienceNOW she is "generally considered the leading Kryptos expert in the world.

In 1989, while she was working as a temporary legal secretary in Los Angeles, this interest overlapped into the early multiplayer games, such as British Legends on CompuServe and Simutronics' GemStone II on GEnie.

Games that she worked on include: Dunin has written books and articles about cryptography, and been interviewed on radio and television about related subjects such as Kryptos, the Smithy Code,[22] and Ricky McCormick's encrypted notes.

[23] In an interview with GIGnews.com, Dunin said that in the year 2000 she cracked the PhreakNIC v3.0 Code, an amateur cryptographic puzzle created by a hacker group, and that this launched her public interest in high-profile ciphers.

[13][29][30][31] When Kryptos sculptor Jim Sanborn chose to release information about an error on the sculpture in 2006, he contacted Dunin to make the announcement.

[1][27] In July 2007, Dunin appeared on the PBS program NOVA scienceNOW, as an expert on Kryptos, and in 2009, contributed two articles about the sculpture for the book Secrets of The Lost Symbol: The Unauthorized Guide to the Mysteries Behind The Da Vinci Code Sequel,[32] a companion book to author Dan Brown's novel The Lost Symbol.