Here are some of the bitter stories of some countries that tried, fro a system theorist perspective it is simply impossible, also just google electronic voting and study the results, sounds like a "good idea" always turns out to be garbage. In systems language, Garbage in Garbage out.

“Through working on this I came to the conclusion, now shared by most computer scientists, that e-voting cannot be delivered securely and reliably with current technology. So I stopped developing the system but continued to campaign on and research the issues,” he said