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01:05 < nickler> nkohen: This sounds a bit like the "unhardened derivation without the downsides"-problem which doesn't have a simple solution afaik. But perhaps ZKP-tooling has matured enough at this point, f.e. you can select Pedersen hash chain in the STARK playground here https://cairo-lang.org/playground/ (whatever that means).
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16:10 < kanzure> "Cuproof: a range proof with constant size" https://eprint.iacr.org/2021/127.pdf
16:10 < kanzure> privacy-preserving watchtowers https://eprint.iacr.org/2021/117.pdf
16:14 < kanzure> win 1
16:14 < kanzure> blah
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18:03 < nick_freeman> Just read https://medium.com/blockstream/a-formal-proof-of-safegcd-bounds-695e1735a348 and wondered why signature *verification* has to be constant time. Isn't constant timeness only relevant when you handle private data (such as when signing)?
18:03 < sipa> it doesn't
18:03 < sipa> but in the current secp256k1 implementation, it is
18:04 < sipa> because only an exponentiation ladder is implemented, or a libgmp-based inverse - which is disabled for fear of consensus dependence on that library
18:05 < sipa> the new safegcd-based implementation is constant-time for signing/keygen, and variable-time for verification
18:05 < nick_freeman> but in theory secp256k1 verification could be faster if the corresponding gcd algorithm wasn't constant time?
18:05 < sipa> yes, and it is, if you enable libgmp now
18:06 < nick_freeman> sweet!
18:06 < nick_freeman> how much faster is it?
18:06 < sipa> after this change, not anymore
18:06 < sipa> because the variable-time safegcd modular inverse is faster than gmp
18:07 < sipa> in fact, gmp support is dropped entirely in it
18:07 < sipa> (or maybe it's not quite faster, but very close to it, and not worth keeping, i forget)
18:10 < sipa> the current constant-time scalar inverse is 9.3 us, the variable-time one (with gmp) is 1.6 us
18:11 < sipa> the safegcd versions (no gmp) are 1.8 us for constant time, 1.1 us for variable-time
18:11 < sipa> on my threadripper 2950x CPU
18:19 < nick_freeman> That is pretty impressive. Congratulations on this great work!
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18:20 < sipa> djb's constant time code is actually even faster (i think it beats our variable-time code slightly)
18:20 < sipa> but it's very cpu specific
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--- Log closed Sat Feb 13 00:00:27 2021