According to the 2016 Threat Report, terrorists will be able to break into once-secure Australian government networks and cause chaos within three years. Foreign powers, not naming any trading partners, are the main threats. Already 1,095 serious cyber assaults have been launched in the past 18 months to June 2016. (The Australian, October 12, 2016, p. 1)
The Islamic terrorists are a little behind in this field, but catching up. They are the ones who will be able to cause chaos in three years; China can do it now. Potential targets are utilities, hospitals, air traffic control systems, electric and nuclear power stations and transport networks.