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ASD can trace its origins back to two Second World War organisations: Central Bureau and Fleet Radio Unit Melbourne (FRUMEL).

ASD works with government and industry to detect and respond to cyber enabled threats to critical infrastructure.

A code book is a reference document that allows the user to encode or decode a message.

ASD's history began with the creation of the Defence Signals Bureau (DSB) in April 1947 in Melbourne, later changing name to the Defence Signals Directorate and moving to Canberra over the period 1991 - 1993.

During the Second World War, the Allies drew strength from their partnerships. After the war, these partnerships continued.

German military forces used the Enigma cipher machine in the Second World War to secure their communications.

Fleet Radio Unit Melbourne (FRUMEL) operated from the Monterey apartments between 1942 and late 1944. FRUMEL played a significant role in the Allied victories in the Pacific, including the battle of Midway (June 1942).

More advanced than the Enigma, the British Portex cipher machine used irregular stepping and eight rotors.

Highly secure, one-time pads use a single-use pre-shared random key.

Global terrorism increased after the 9/11 attacks in the United States. In 2004, a car bomb detonated outside the Australian Embassy in Jakarta destroyed this coat of arms.