You're right that this is a simple electronic voting scheme. The thing is that cryptographers are working on e-voting for decades and the idea to use homomorphic commitments (or encryption) and zero-knowledge proofs is not new in this area. It's rather the case that e-voting inspired a lot of work on homomorphic crypto and related zero-knowledge proofs. For example, range proofs are overkill in e-voting. You just need to ensure that the sum of all my votes (over all candidates) is 1. E-voting protocols typically require some "bulletin board", where ballots are stored. A blockchain could indeed be helpful in specific cases (but not in all cases)...
If you're interested in that stuff, I'd suggest you to read some literature about e-voting. (For example, https://arxiv.org/pdf/1801.08064 looks interesting for the connection to blockchains -- I haven't read it though). There are pretty sophisticated protocols in the literature. And I think that this mailing list may not be the best place to discuss these. Best, Tim On Sun, 2018-03-11 at 13:44 +0100, JOSE FEMENIAS CAÑUELO via bitcoin- dev wrote: > If I understand Bulletproof Confidential Transactions properly, their > main virtue is being able to hide not the senders/receivers of a coin > but the amount transferred. > That sounds to me like a perfect use case for an election. > For instance, in my country, every citizen is issued a National ID > Card with a digital certificate. > So, a naive implementation could simply be that the Voting Authority, > sends a coin (1 coin = 1 vote) to each citizen above 18. This would > be an open transaction, so it is easily auditable. > Later on, each voter sends her coin to her preferred party, as part > of a Bulletproof CT, along with 0 coins to other parties to disguise > her vote. > In the end, each party will accrue as may votes as coins received. > > Is there any gotcha I’m missing here? Are there any missing features > required in Bulletproof to support this use case? > _______________________________________________ > bitcoin-dev mailing list > [email protected] > https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev _______________________________________________ bitcoin-dev mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev
