Successive Australian governments have consistently refused to admit Australia ever intercepted diplomatic communications, even in war-time.

Now a new book by ANU College of Asia and the Pacific academics Professor Desmond Ball and Dr Keiko Tamura lifts the lid on the most secret of the Allied code-breaking organisations in Australia during World War II.

In this video Ball and Tamura discuss the work of D Special Section, and their book about the group, Breaking Japanese Diplomatic Codes.