CANBERRA—In early 2018, in a complex of low-rise buildings in the Australian capital, a team of government hackers was engaging in a destructive digital war game.
The operatives—agents of the Australian Signals Directorate, the nation’s top-secret eavesdropping agency—had been given a challenge. With all the offensive cyber tools at their disposal, what harm could they inflict if they had access to equipment installed in the 5G network, the next-generation mobile communications technology, of a target nation?
