Breaking Japanese Diplomatic Codes: David Sissons and D Special Section during the Second World War

This book recounts the history of the Special Section and describes its code-breaking activities. It was a small but very select organisation, whose ‘technical’ members came from the worlds of Classics and Mathematics. It concentrated on lower-grade Japanese diplomatic codes and cyphers, such as J-19 (FUJI), LA and GEAM. However, towards the end of the war it also worked on some Soviet messages, evidently contributing to the effort to track down intelligence leakages from Australia to the Soviet Union.