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And the problem always is: how are you going to verify that the terminal you're using is running precisely the version of software you've seen?

There's an awesome online course touching all those topics and then some, from J. Alex Halderman, Associate Professor in University of Michigan. It's called 'Securing Digital Democracy' and is available on Coursera: https://www.coursera.org/learn/digital-democracy

That's a good point, and thanks for the recommendation!

Checksum?

Performed by whom?

The only software that should matter for election is what email client you use to send the ballot's pdf to the printer, and the online store where you buy the pens.

That's where it matters least because it doesn't solve the problems with electronic voting computers.