There are many steps along the chain that have to be secured in both electronic voting (which has a variety of meanings) and paper ballots. Paper ballots enable audibility, which is a separate issue that's also important for voting.

Given the number of comments you've made on this thread, it seems this is an area of interest to you. I encourage you to look though the previous HN discussions on this topic. Here's a list of some of those from the past month or so:

https://news.ycombinator.com/item?id=13032743