#bitcoin-wizards on 2017-12-15 — irc logs at freenode.irclog.whitequark.org

2015-10-30 00:53 sipa changed the topic of #bitcoin-wizards to: This channel is for discussing theoretical ideas with regard to cryptocurrencies, not about short-term Bitcoin development | http://bitcoin.ninja/ | This channel is logged. | For logs and more information, visit http://bitcoin.ninja

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06:40 <adlai> ;;later tell piano17 yeah bigger blocks are the partially hydrogenated fats of the intertubes

06:40 <gribble> The operation succeeded.

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16:30 <maaku> how do I prove that an elgamal commitment of the form (g^r, g^m * h^r) is actually an elgamal commitment in zero knowledge?

16:31 <maaku> only h is publicly known. g, r, and m are confidential

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17:34 <maaku> sorry m is known (public) in this application, if it matters

17:34 <maaku> i suspect that having g be confidential makes this very difficult, but I'm curious as a first step how you'd do it still with a known generator

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18:30 <nickler> maaku: if g, h and m are publicly known, you could multiply the second element by the inverse of g^m and then create a proof of discrete log equivalence between g^r and h^r.

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18:43 <waxwing> that requires that G is known tho'

18:44 <waxwing> (not that i understand the context, but maaku said g is confidential)

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18:49 <maaku> yes, and then I back tracked and asked what to do if g was known, since that might be a clue pointing me in the right direction; thanks nickler

18:50 <maaku> but yes, this application has a not-publicly-known g

19:01 <nickler> If g is unconfidential this doesn't seem to be necessarily binding. If r=0 then and (r, g, m) is a valid opening, then (r, g^2, m/2) is another valid opening.

19:01 <waxwing> maaku, oh sorry i'm blind :)

19:05 <waxwing> nickler, huh, so you're assuming a scenario where g is not fixed?

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19:08 <nickler> I was assuming a scenario where the prover fixes g. But maybe I misunderstood.

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