As long as you can see your own vote, someone can force/coerce you to show them your vote.

Not necessarly. For example you could have the machine print a ticket with the vote and show it to the voter behind a window. The voter:

- confirms (paper goes down the box) and exits the booth

or

- cancels (paper is burned) and votes again

Right, because the person coercing the voter wouldn't know of this little trick and wouldn't make sure the voter doesn't do it. Riiight.

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