The decision to release the long-awaited review of the census failure now sits with the prime minister, says his special adviser on cyber security. Alastair MacGibbon, Special Adviser to the Prime Minister on Cyber Security and author of the post-mortem and learnings report, told an AISA security conference this morning that the timing of the report\u2019s release was now in the hands of Malcolm Turnbull. \u201cThat\u2019s a matter for the prime minister,\u201d he said. \u201cI\u2019ve given my advice to the PM on the things we can learn from the census. It would be fair to say there are things that we can learn from the census\u2026It is a matter for the prime minister what we release.\u201d MacGibbon said he would be appearing in front of a Senate inquiry into the census debacle next week. Pushed on why the report had taken so long to complete, MacGibbon joked: \u201cI had to write it. And I type slowly.\u201d Embellishing on the delay, he explained that he wanted to \u201cmake sure we got it right\u201d. \u201cWe had to look at what actually happened on the night, then we had to look at what the learnings were,\u201d he said. \u201cThat takes time. The report is now with the prime minister and it\u2019s for him to consider and probably to be considered by others in government as well. So it does take time. And we had a few other things on. But it was important to get it right to know what happened.\u201d The Australian Bureau of Statistics (ABS) pulled the August Census website offline after what it claimed was a series of minor denial of service attacks followed by a hardware failure that led to a misidentification of a large-scale denial of service attempt. A blame game has already begun between the vendors and providers involved in implementing the census. Main contractor IBM has pointed the finger at government agencies and at least two internet service providers in its submission to the investigating committee. Meanwhile ISP Nextgen and its upstream supplier Vocus have called IBM\u2019s account of events into question. MacGibbon added that the denial of service protection that was in place \u201cwasn\u2019t sufficient\u201d, and reiterated that the real damage was to trust in the government. \u201cWhen you think about it: it wasn\u2019t a significant cyber issue, there was no nation state doing harm to us, there was no massive loss of data, there\u2019s no compromise of a critical intelligence agency. But it resonates with the Australian public," MacGibbon said. \u201cAs painful as the night and the days that followed were. There are things we can learn from that, that will actually increase, even for the doubters, the trust and confidence in the way the government delivers services. Out of failure you can get success.\u201d Last night, in front of a Senate Estimates Committee in Canberra, head of the ABS David Kalisch said that the IT bungle would cost an extra $30 million to rectify. Kalisch will be questioned further at the Senate inquiry next week.