[1] e-voting option for the Australians has been struck off by Australian Parliament the list due to fears of security and costs that comes with the technology.
[2] This comes from reports of hacking cases in the US electronic system which has made the Australians fearful of the security of such a system.
[3] As an alternative to the electronic system, parliament proposed the introduction of the electronic electorate rolls at polling stations, in addition to the electronic-assisted counting of ballot papers.
[Source] http://www.futuregov.asia/articles/5756-e-voting-out-of-the-picture-due-to-security-cost-concerns