The International Museum of World War II was a nonprofit museum devoted to World War II located in Natick, Massachusetts, a few miles west of Boston. It was formed over a period of more than 50 years by its founder, Kenneth W. Rendell, one of the world's premier dealers in autographs, letters and manuscripts, who has earned international renown as an authenticator of historic artifacts. The museum's collections documented the events of the war, from the signing of the Treaty of Versailles ending World War I to the Nuremberg and Tokyo war crimes trials. The museum's goal was to preserve the reality of the history of World War II and to provide an educational experience of the lessons to be learned. In 2016, the Museum of World War II became The International Museum of World War II to reflect its being the only museum in the world with an international collection of letters, documents, and artifacts.

The Enigma machine is a cipher device developed and used in the early- to mid-20th century to protect commercial, diplomatic, and military communication. It was employed extensively by Nazi Germany during World War II, in all branches of the German military. The Enigma machine was considered so secure that it was used to encipher the most top-secret messages.