Australian spy agency warns businesses to brace for a wave of cyberattacks around G20 summit. Hackers “would love to just get into the traffic light system for example and just disrupt that and what they’re after really is free international media,” said Greg Rudd, spokesman for the Council of Registered Ethical Security Testers, or CREST Australia. Australia’s G20 Operations Center is a state-of-the-art surveillance center with unprecedented capabilities that spark.”]