I think it was Stalin who said that elections are not decided by the voters, but by those who count the votes. I am all for electronic voting machines, but we better have built in safeguards to ensure that no one is jimmying the results, because it would be impossible to know what the actual outcome should have been.
Nothing built by man can't be cheated by man. "As secure and fair as reasonable" should be the goal. Completely secure and fair is impossible.