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The Allies used the Rockex, an electronic valve-based one-time tape system, from 1943 onwards.

The Australian Defence Satellite Communications Station (ADSCS), located at Kojarena, about 30 kilometres east of Geraldton, Western Australia, contributes to Australia’s national security and defence.

Women played a crucial signals intelligence role during the Second World War. The women of No. 11 Cipher Section operated Typex machines to process the huge daily volume of allied coded communications.

Nicknamed the ‘Garage Girls’, these women operated British TypeX cipher machines to encrypt and decrypt communications between Central Bureau and other allied command Sigint centres such as FRUMEL or Bletchley Park.

The British-developed Typex could be modified to emulate the settings of the Enigma, the famous German cipher machine ‘broken’ by Bletchley Park during the Second World War.

Formed in 1941, the Women's Royal Australian Naval Service (WRANS) played an important role in signals intelligence during the Second World War.

The need for secure communications has driven advances in technology. With its convenient telephone handset, the STU-II enabled governments to make secure domestic and international calls between two devices.

Towards the late 2010s, ASD’s counter-terrorism team helped disrupt several attacks planned by the Islamic State of Iraq and Syria (ISIS).