Australian Census online

An interesting story was in the Australian IT to on how the 2006Australian Census will have an option to be completed online. I am not really sure what to make of it. While I think it is a great step forward I have a healthy scepticism on the security of the system. I know that once I fill in my form the data is entered into a computer but this is different.

Couple with that it also seems I will need to get use to voting online in the up and coming 2006 Victorian elections.

Still I wonder about how the government will ensure my identity online is secure and 100% accurately authenticated. Also what would happen if a DOS affect or specifically written worm/virus was to attack the sites?