I'd need a crypto system allowing online yes/no votes but without revealing who voted what. Is a "partial" homomorphic crypto system what I'm after? Would, for example, Damgard-Jurik work in my case?
In my scheme there would be a server getting the votes and the server shouldn't see who voted what. However we can consider that the server shall not cheat: he won't modify the voting results. But the votes should still be anonymous.
If I need homomorphism, how does it work? Does each voter need to get the encryption from the previous voter? Or can the centralized server receive all the encrypted votes and then "mix" them himself and, once mixed, get the result?
How does it work it there are say, four voters: does the scheme break if only three people vote?
For example I played with the nice simulator here, which expects 8 voters. You can't put seven voters on that page: is this just an implementation detail of that site or is Damgard-Jurik expecting all the votes from a number of voters known beforehand?
Also the page shows who voted what, but it's not clear to me if it's for instructional purposes or if, when the vote counts happens, the votes aren't anonymous anymore.