I don't have near the expertise to argue against the technology. I agree that there's no reason, technologically speaking, it can't work. However, it's the trust issues that are going to keep this out of serious consideration.
I was pretty big into Black Box Voting/Open Source Voting back in 2004; that election was straight-up stolen. Thing is, it was stolen easily and as far as voting reforms go, the biggest one is getting the kids and minorities to show up. Frankly? I think the whole country should just go absentee. Keep your receipt. Any questions? Revote.
Oregon is vote by mail. You can go to a polling place and cast a vote if there was a reconcilable problem with your ballot but other wise all by mail. I don't know of any problems with the system and it helps push turn out up a bit. So Fuck Yea! Lets have Vote by mail!