Ron Rivest has written a paper on a secure voting system. ⇒
27 September 2006, lunch time
"We present a new paper-based voting method with attractive security properties. Not only can each voter verify that her vote is recorded as she intended, but she gets a 'receipt' that she can take home that can be used later to verify that her vote is actually included in the final tally. Her receipt, however, does not allow her to prove to anyone else how she voted."
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