Re: Most Secure Voting Machine
In Denmark (at least) where everybody is registered to a scary degree, that cannot happen. By law you have to register in the municipality where you have your residence, and the electoral roll is simply the subset of residents who are old enough to vote and have suitable nationality. Yes, prisoners can also vote.
The consequence is that when you status changes to "dead" you are token off the roll.
These are the upsides of the pervasive registers.