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4

Probably the most basic use case for Shamir's secret sharing (or other similar threshold secret sharing schemes) is safely storing a secret key. For example, let's say you bought some Dogecoin as a joke when it was cheap, and now your coin wallet is suddenly worth millions. Or let's say you're working for a software company and you've been tasked with ...


4

If no then what is the purpose for him to involve in the scheme? This sort of "why would someone perform this protocol" question is something that crypto does not address. Perhaps the dealer is the author of his own will, and he is delivering shares of it to his inheritors (for them to recombine after his untimely death). Perhaps he is the owner ...


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Blockchain is just a tool to make communication 100% transparent and to avoid a central authority. Yes there are other ways to allow anonymous voting. I know of two ways. A simple approach is that everyone signes their vote with a linkable ring signature. That way you can make sure, that the vote came from someone who has the right to vote and that noone ...


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I am assuming that [electronic elections whereby participants can vote over a network and the results can be publicly tallied without revealing any individual’s vote] refers to Blockchain technology. Are there any other ways of achieving the same? Voting schemes using Blockchain technology mainly aim at avoiding a central authority. I doubt this is what's ...


1

In general this is not possible. Assuming a finite group, for any $A$ in the group and for any $x$ in the group, the pair $(x,A-x)$ is a possible solution. You cannot do any better. If you have some side information which enables you test a value $x$ for being valid, you would at worst still need to test every $x$ in the group. This property follows from the ...


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