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<H1>[zapps-wg] Powers of Tau participation + zk proof question</H1>
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<B>Sean Bowe</B>
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<A HREF="mailto:zapps-wg%40lists.zfnd.org?Subject=Re%3A%20%5Bzapps-wg%5D%20Powers%20of%20Tau%20participation%20%2B%20zk%20proof%20question&In-Reply-To=%3CCAKazn3nRVuTkyF1kcHtZdgmFCsQnKga-P1XM6FxJWKf4vFmccw%40mail.gmail.com%3E"
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TITLE="[zapps-wg] Powers of Tau participation + zk proof question">sean at z.cash
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<I>Wed Jan 3 15:10:47 EST 2018</I>
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<PRE>If any curve is acceptable, I would encourage Jubjub, which we'll be
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using for the next version of Zcash. In which case you will be able to
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leverage our Sapling crypto code once it is more mature over the next
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month or so. <A HREF="https://github.com/zcash-hackworks/sapling-crypto">https://github.com/zcash-hackworks/sapling-crypto</A>
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Sean
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On Wed, Jan 3, 2018 at 1:02 PM, James Prestwich via zapps-wg
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<<A HREF="/mailman/listinfo/zapps-wg">zapps-wg at lists.z.cash.foundation</A>> wrote:
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><i> I'd prefer sha256 or bitcoin-style hash160. I'm interested in a few
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</I>><i> different curves, including secp256k1. Eventually for EdDSA keys as well. Is
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</I>><i> there a list of supported curve operations?
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</I>><i>
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</I>><i> On Wed, Jan 3, 2018 at 12:57 PM Andrew Miller <<A HREF="/mailman/listinfo/zapps-wg">soc1024 at illinois.edu</A>> wrote:
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</I>>><i>
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</I>>><i> Thank you so much for expressing your question in Camenisch-Stadler
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</I>>><i> notation! That makes it very clear what you're going for.
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</I>>><i>
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</I>>><i> What hash function H do you have in mind, would SHA2 work? Also what group
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</I>>><i> G do you have in mind, secp256k1?
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</I>>><i>
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</I>>><i> If so, I do not know of any existing implementation of secp256k1
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</I>>><i> operations specifically in libsnark, so that would presumably be the biggest
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</I>>><i> challenge.
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</I>>><i>
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</I>>><i>
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</I>>><i> On Jan 3, 2018 1:47 PM, "James Prestwich via zapps-wg"
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</I>>><i> <<A HREF="/mailman/listinfo/zapps-wg">zapps-wg at lists.z.cash.foundation</A>> wrote:
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</I>>><i>
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</I>>><i> I'd like to participate in the setup ceremony.
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</I>>><i>
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</I>>><i> I also have an app I'd like to build using a zk-proof of knowledge of an
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</I>>><i> ECC private key. {(a) : A = a * G, B = H(a)}. Can anyone point me to good
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</I>>><i> resources on getting started?
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</I>>><i>
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</I>>><i>
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</I>><i>
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</I>
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