Cyber spies beef up nuclear secret defence

Australian Signals Directorate head Rachel Noble says the technology demands the best cyber defence. (Bianca De Marchi/AAP PHOTOS) (AAP)

Australia's top cyber spies will be working overtime to prop up the defence force as Canberra prepares to handle sensitive nuclear secrets.

The federal government is preparing to receive the US and UK's most guarded nuclear secrets when it acquires nuclear-propelled submarines under the AUKUS agreement.