If you have a driver's licence you are already matched to your...

If you have a driver's licence you are already matched to your address.  The Census database is very secure and not accessible by any other department by law.  However, if you do it online, your ip address will be easily traced.  I don't think the ABS will get the results it wants, because people are so paranoid about privacy, yet their identity is easily accessible if the Government wants to come looking.  I don't care.  I've got nothing to hide.