I think I could specify a near foolproof voting system that should work.
The AEC officier in charge brings to the site the number of laptops
required already loaded with the electrol roll.
The person operating it when a voter turns up enters the name &
address and an attached printer puts out a ballot paper.
The voter takes it to the booth and numbers the squares which he then
feeds into a mark sensing reader in the booth.
If he has not numbered each square it returns the ballot paper.
If the ballot paper is indecipherable it returns it torn accross or marked invalid.
The voter can then go to the desk and ask for another (weak point
here) or just leave the site as an invalid voter.
A valid vote transmits the info to the central computer.
The desk laptops transmits the identity of the voter and ticks him
off the list on the central roll.
If the ticking off was done on line duplicate voting would be impossible.
The duplicate voter could only use that name once.
The laptop would have no USB ports and the roll would be in eproms.

I can see why the US has not used a system like this. Cheating would
be very difficult.

"On Trump, both VP Mike Pence and Trump's hand picked AG William Barr, both believed there was insufficient evidence of voter fraud to overturn the result."

Yes they did. But a mountain of new data has emerged since those early days - see my link above. Barr now says he'd vote for Trump if he runs again.

Bazz,

All the pre-poll sites ran computerised rolls (ECL - Electronic Certified Lists). The one I was at for example had 6 laptops, four of which could access the rolls for the electorate we were in and 2 could access the data for the whole nation. All data was was updated each morning and periodically through the day over secure propriety WiFi. All data was wiped each night AFTER the central database was updated. Once people voted, their name was flagged so that they couldn't vote again.

As to having machines determine if the vote was valid, I see problems in cost and maintaining voting secrecy. FYG, all Senate papers were scanned to extract the voting data. The papers were sent to a central AEC bureau and were run through a scanner and character reader. Indecipherable ballots were sent to a human to check and try to work out the votes. My understanding is that about 18% of all papers needed human intervention to work out the vote. Doing that in the 6000 or so booths Australia wide on election day would be an horrendously expensive and time-consuming system.

Hi Bazz,
"I can see why the US has not used a system like this. Cheating would be very difficult."

If you were to incorporate your ideas, with voter ID's or even Drivers licenses for example to verify a person identity, and that data was kept on a blockchain, which could not be hacked unless you simultaneously hacked all of the nodes, then yes, it would be an absolutely foolproof system, unhackable and unbreakable.

mhaze,
As I recall, the intention was that the vote could not be exhausted, so you had to number all the boxes. However someone discovered a loophole: the boxes didn't have to have unique numbers for the vote to be valid, so the votes could be exhausted by giving different boxes the same number, and I think someone confirmed it in court.

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Armchair,
Both parties moved right in the 1980s and 90s, and it's taken this long tor the results of that to become obvious.
I can't think of any sensible initiatives coming from the right for a very long time!

Aiden said "Both parties moved right in the 1980s and 90s, and it's taken this long tor the results of that to become obvious."

Answer- In my view both parties have moved to the far left. But perhaps they've moved far from Traditionalism.

Some people clearly cannot tell left from right.

There are no right wing parties in Australia, apart One Nation, which barely exists.

Liberal and Labor have barely a cigarette paper between their brands of socialism. Dutton, the great white hope, is saying 'of course we need renewables - but', and the rest of them - what's remaining - are still bragging about their sacked government’s 'biggest investment in renewals ever'.

I wouldn't piddle on any of the Australian political class if they were on fire.