#bitcoin-wizards on 2018-03-03 — 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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13:16 <jonasschnelli> Does anyone know of a scheme that is capable of generating a "proof" that user-entered entropy has been mixed into the seed without revealing the additional user-entered entropy (or the base entropy)?

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13:19 <jonasschnelli> Usecase: TRNG (HWW) + host-entropy = seed,... now HWW should be capable to provide a "proof" that can be verified on the "host" that a child-keys generated by the HWW did actually used the user provided additional entropy

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15:37 <kanzure> jonasschnelli: sounds like a use case for a zero-knowledge proof, where one of the inputs is hidden (the seed that you don't want to reveal but want to prove has been updated with user-supplied entropy)

15:38 <kanzure> thankfully, hash functions are very expensive to put into a snark

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15:55 <sipa_> kanzure: you can construct hash functions that are easier to prove in zk systems

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16:01 <sipa_> if you don't need uniformity but just collision/preinage resistance, a pedersen hash function cna be used over an EC curve whose field size is the proof system's scalar size - for around 8 multiplication gates per 3 bits of hash input

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21:51 <waxwing> have people here seen this by Chator and Green? https://isi.jhu.edu/~mgreen/mixing.pdf (i don't know the date)

21:51 <waxwing> "Reducing bandwidth in mixing cryptocurrencies"

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22:52 <roasbeef> waxwing: i've seen green mention the work off-hand before, but today was the first time i'd seen him publicly link to it (on twitter)

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