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Here's the scenario I have in mind. We have three mixers.
At each stage, we validate 1/5 of the votes, and we have to audit the last one.
We don't have another mixer here.
We need some designated output auditor that receives these outputs
as well as these and audits the last one.
That's our three-step mix net. At the end of this, some votes are revealed.
The question is if an eavesdropper, who can observe messages along all these channels
and observe all of them, can determine which voter cast this vote.