# Is “Bingo voting” insecure against a corrupt election authority?

I am reading about "Bingo voting" (Wikipedia, Paper), and I'm not understanding how it is secure against a corrupt election authority.

If the election authority knows all the dummy votes $$N_j^i$$, can't it just look at any voter's ballot and tell who they voted for (by finding the candidate on the ballot whose vote is not a dummy vote)?

My question: does the election authority have to be trusted in order for people's votes to be secret from the authorities?

• Well, can you define the capabilities of the corrupt election authority? Does it contain access to the random number generator, observing the voting machine which is not open during the voting? – kelalaka Oct 14 '19 at 17:51
• No, it just knows all the dummy votes @kelalaka – ATOMP Oct 14 '19 at 21:46
• Thanks for your question -- I figured it out. I missed that the interactions with the voting machine are anonymous, so there's no way to link ballots with identities. – ATOMP Oct 14 '19 at 22:21
• helper, would you mind answering your own question with the answer you inferred? – SEJPM Oct 15 '19 at 7:40