"with two paper receipts (one for the voter and one for the auditors.)"
I disagree- the voter should be able to see the printed receipt confirming his vote, but shouldn't have a receipt to take home. What's to stop his boss from telling him to vote a certain way and bring in your receipt to prove it? Or selling your vote and using the receipt as proof? Disallowing voters receipts helps protect the voter.
"with two paper receipts (one for the voter and one for the auditors.)" I disagree- the voter should be able to see the printed receipt confirming his vote, but shouldn't have a receipt to take home. What's to stop his boss from telling him to vote a certain way and bring in your receipt to prove it? Or selling your vote and using the receipt as proof? Disallowing voters receipts helps protect the voter.