With encryption/hashing, maybe requiring some of that "process encrypted data without decrypting the data" fancy papers from a year or two ago that I never unde

With encryption/hashing, maybe requiring some of that "process encrypted data without decrypting the data" fancy papers from a year or two ago that I never understood, can't we do some basic anti-fraud measures? Sure, we use a computer to produce a paper ballot (computers DON'T count or keep counts). The voter has a voting id that is hashed/encrypted/processed in such a way that the number is verifiable as a valid ballot hash (maybe using some sort of public/private key pair) so hashes can't simply be randomly generated. So the computer UI produces the ballot. The voter is told to check their ballot reflects what they wanted to vote for. The ballot is scanned with a scantron.