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The official line is that ‘mixed’ systems can be pretty secure but then this happened: https://www.google.com/amp/time.com/5366171/11-year-old-hacked-into-us-voting-system-10-minutes/%3Famp%3Dtrue
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Be much Greener (& easier to count) to get rid of Paper voting forms. Higher chance of rigging outcomes though?
There's no digital system that's provably 'safe' and not susceptible to manipulation or loss of anonymity.
(The current system makes it very difficult to break the anonymity side of things and, over the years, has resulted in completely insignificant levels of voter fraud.)
Stations are having problems here with ballot box capacity, suggesting an unusually high turnout.