#bitcoin-wizards on 2018-04-28 — 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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09:55 <waxwing> i think this is what was popping into my head yesterday, using paillier for threshold, i remember it being discussed here at the time: https://eprint.iacr.org/2016/013.pdf

09:57 <waxwing> right, makes sense, this paper cites lindell https://eprint.iacr.org/2017/552.pdf which cites that

10:00 <waxwing> is there a general understanding of why people haven't chosen to implement stuff like threshold ecdsa using paillier? iirc the assumptions are RSA style for paillier aren't they?

10:02 <waxwing> hmm slow and heavy perhaps? istr a lot of 2PC stuff can be quite expensive?

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10:54 <waxwing> ok on that lindell claims to be two orders of magnitude faster than the previous, so :)

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16:49 <jcorgan> i'd think there's still a lot more surface to get right

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19:23 <Ryan1____> anyone know what DH% in cgminer status page is?

19:24 <Ryan1____> what DH% is lol?

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22:56 <roasbeef> waxwing: i think most haven't implemented it just due to the increased complexity of implementation (vs like add these two points together), though iirc the princeton paper had an impl in bitcoinj that i don't think was ever released

22:57 <roasbeef> we have an impl of the OG 2PC portion, as the immediate target was having funding outputs look just like p2wkh

23:02 <andytoshi> roasbeef: cool! do you have a link to that?

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23:36 <roasbeef> andytoshi: the 2PC implementation? not in a public repo yet, can ask conner to push it up if peeps wanna check it out. iirc, the main challenge was that one of the initial zkp's for correctness of the paillier keypairs wasn't super well described so had to rely on some other papers to peice it all together

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