The Website for the Australian Census was attacked by foreign hackers. The ABS says they spent hundreds of thousands of dollars in testing the the ABS Website.
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The actual hack was DDoS which is short for Distributed Denial of Service.
DDoS is a type of DOS attack where multiple compromised systems, which are often infected with a Trojan, are used to target a single system causing a Denial of Service (DoS) attack. Victims of a DDoS attack consist of both the end targeted system and all systems maliciously used and controlled by the hacker in the distributed attack.