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ThreeBallot is a voting protocol invented by Ron Rivest. ThreeBallot is an end-to-end (E2E) auditable voting system that can in principle be implemented on paper. The goal in its design was to provide some of the benefits of a cryptographic voting system without using cryptographic key. It may be difficult for a vote to be both verifiable and anonymous. ThreeBallot attempts to solve this problem by giving each voter three ballots: one verifiable, and two anonymous. The voter chooses which ballot is verifiable and keeps this secret; since the vote-counter does not know, there is a 1/3 chance of being discovered destroying or altering any single ballot. The voter is forced to make two of his three ballots cancel each other out, so that he can only vote once. == Goals == The crucial advantages that the ThreeBallot system offers over comparable, ciphered ballots are: #Its implementation is ''familiar looking and simple for voters to understand'', compared to other encryption systems (arguably, the most important advantage of all). #The ballots can be counted directly, without decryption. This is because they have the property that ''the sum of the marks is the sum of the votes for the candidate'', even though any individual ballot section cannot reveal the candidate preference of the voter. #There is ''no key that requires protection or secrecy'' in order to maintain security (the "Achilles' heel" of many proposed systems). #While it requires a machine to validate the ballots before depositing them, afterwards ''the ballot record is entirely on paper'', and requires no additional security process beyond that afforded traditional ballots. Additional theoretical system goals include: #Each voter's vote is secret, preventing vote-selling and coercion. #Each voter can verify that his vote was not discarded, and was correctly used and not altered, in the computation of the election result. (And if not, the voter is in a position to ''prove'' the vote counters cheated.) #Everybody can verify the election result was computed correctly. #The method is designed for use with paper ballots and requires primarily low-tech devices, but is compatible with more advanced technologies. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「ThreeBallot」の詳細全文を読む スポンサード リンク
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