@Unpublished{Riv06c, replaced-by = { RS07 }, author = { Ronald L. Rivest }, title = { The {ThreeBallot} Voting System }, date = { 2006-10-01 }, OPTyear = { 2006 }, OPTmonth = { October 1, }, note = { Unpublished draft. }, abstract = { We present a new paper-based voting method with interesting security properties. The attempt here is to see if one can achieve the same security properties of recently proposed cryptographic voting protocols, but without using any cryptography, using only paper ballots. We partially succeed. (Initially, I thought the proposal accomplished this goal, but several readers discovered a vote-buying attack (see Section 4.4) that appears to be rather difficult to fix without making the resulting system much less usable in practice. Currently, this paper should thus be viewed more as an academic proposal than a practical proposal. Perhaps some variation on these ideas in this paper might still turn out to be of practical use. The ``OneBallot with Exchanged Receipts'' system sketched at the end of Section 5.3.1, looks particularly promising at the moment\ldots ) }, }