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    UPD: Colleagues assure me that there is a solution: incoercible encryption.

    Are these colleagues working on encryption or colleagues working on voting security? The two groups have very different ideas on what “solution” means.

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      I still think the section in Applied Cryptography I read on voting is the best. It got across just how many contradictory requirements there are in it. They require complex crypto that’s both prone to failure, computers prone to hacking, and many non-technical people won’t trust them in the first place. Better to just use paper with optical scan speeding up the count where that matters.

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      I feel strange but I still have not seen one good use case for block chain. I also consider them unsuitable for money. Give the people with most computing resources (or memory or whatever) the biggest say, just seems silly and a waste of sad resources.

      you can use conventional cryptography to require a subset of multiple predetermined parties to undersign a transaction. you can also design a way to change the allowed parties.