The Sandi Museum is located in a heritage building in Dutch architecture, which was used as the office of the Ministry of Foreign Affairs in 1947. In addition to knowledge about the history of crypto during the Dutch Military Aggression I and II, this museum also introduces how to create a simple crypto message using a pencil and paper.

This museum contains the history of establishing a private news security institution at the beginning of Indonesia's independence by the father of Indonesian cryptology, Dr. Roebiono Kertopati.

The Sandi Museum was built in 2006 on a joint initiative among the Head of the Indonesian National Crypto Agency, Major General of the Indonesian National Armed Forces, Nachrowi Ramli, and the Governor of the Special Region of Yogyakarta, Sri Sultan Hamengku Buwono X.