As Australia is still mainly paper-based ballots in elections, we don't have to worry about that particular possibility. Instead it's potential man in the middle attacks on a booths tallied votes to the central point.
Also there are computers present (I should know, as I set some booths up some years back) but are mainly for electoral roll database use, out of seat votes & supposedly enabling ability impaired citizens to vote, the aforementioned tally transfer. All, I think you could do is inject additional voters to the local roll.
Also there are computers present (I should know, as I set some booths up some years back) but are mainly for electoral roll database use, out of seat votes & supposedly enabling ability impaired citizens to vote, the aforementioned tally transfer. All, I think you could do is inject additional voters to the local roll.