The government says the data will be safe. I'm pretty sure the US Government thought the same of its federal employee data until it ended up in the hands of Chinese hackers last year following the massive data breach at the Department of Personnel Management.
No system is 100 percent secure from the efforts of a determined and well-resourced adversary. And let's not forget government employees have been caught accessing data they should not have over 60 times during 2012 and 2013.
You may decide not to complete the census as a protest. Well, not completing the census will result in fines of $110 per day for non-submission.
The Australian Privacy Foundation outlines some things that people may have contemplated during the 2011 census to avoid their data being recorded. Of course, I'd never advocate breaking the law and I suggest that if you are contemplating some form of protest against this year's census to make sure you do so lawfully and in full understanding of any potential consequences.
Source: Macworld AU
Sign up for Computerworld eNewsletters.