No closed source voting machine will ever be secure.
To expound on this, that doesn't mean a FOSS system will be, but rather that it might be possible for it to be secure.
I'd start with an NFC based phone app that can check all firmware/software checksums so that every voter can confirm the machine hasn't been tampered with for themselves.
Still ain’t gonna trust computers to count my vote properly
Let me repeat myself.
No closed source voting machine will ever be secure.
To expound on this, that doesn't mean a FOSS system will be, but rather that it might be possible for it to be secure.
I'd start with an NFC based phone app that can check all firmware/software checksums so that every voter can confirm the machine hasn't been tampered with for themselves.
Ditto