Any time your voting system for the general public involves "fiddle with this computer/software", you've lost. The public in general can't handle security methods, and many folks just shut their brains down when it comes to computers. Similarly, if you can't explain the method in terms they can understand, then their trust in the system will simply not be there.

People lose wads of cash that are valuable to them; they're going to care even less about their electronic verification file.