"as secure as paper voting" Nah:
If you can instantly analyse who has voted, you can create phantom votes for people who haven't on the server.
Software can tell them one story and tell the tally machine a different story.
If you can grab that voting database, you can analyse for gerrymandering and disenfranchisement. You have a precise database that's easy to copy.
As the Russians did to Estonia, attack the servers for areas that don't like the Russian backed candidate to block the voters.
You have to make elections difficult to rig, paper trails everywhere to check, people, the dumbest, smartest, tech savvy, non-tech savvy people need to be able to verify the vote themselves and see for themselves the vote is correct.
Auditable paper trial or paper ballots. In sealed boxes, transported with witnesses for the parties being voted on, counted in front of witnesses for the voting parties. It is the one an only truely trusted system, its the one everyone can verify.
Nothing stops you printing an icon on the ballot for people who cannot read.
ONCE YOU LOSE DEMOCRACY, it's gone, poof. It never comes back, the dictator in power can always rig the rules to stay in power, and you should realize how quickly the checks and balances crumble. How quickly the cronies will line up around the dictator.
Also realize that Russia attack US election *roll and record* systems in 2015. Do not assume that doesn't let them rig an election it certainly lets them know who to create phantom votes for.
But this (below) remains the easiest technique to win elections, simply block voters from voting. Be it students, renters who move around, non-drivers, by refusing lots of ids.