The Australian Signals Directorate (ASD) has developed a list of 35 mitigation strategies to mitigate targeted cyber intrusions. These are ranked in order of overall effectiveness. Analysis undertaken by ASD indicates that at least 85 percent of cyber attacks they responded to could have been prevented if the top four in this list had been implemented. This top four is often referred to as the “ASD Top 4” and their implementation is mandatory for certain Australian Government entities. The ASD Top 4 are:

To support this, the Australian Government Information Systems Manual (ISM)  includes 23 mandatory controls that relate to the ASD Top 4.

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