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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<nothingmuch>
in a Schnorr like sigma protocol, is it valid for a response scalar to be 0? i received a suggestion to check for that, but i can't convince myself that's the right thing to do
<nothingmuch>
seems to me like that breaks completeness with negligible probability, and can't be exploited since constructing an adverserial commitment requires advance knowledge of the challenge
<sipa>
nothingmuch: response scalar, the 's' value?
<nothingmuch>
sipa: yes
<nothingmuch>
in this case the actual protocol is a generalized version, so it's an n * m scalars
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<sanket1729>
nothingmuch: Does s=0 it really break completeness? I don't think s = 0 should be an issue
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<sanket1729>
I think protocol is proved perfectly complete
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<nothingmuch>
sanket1729: i don't think s=0 is an issue (can't see how that breaks soundness), and i think adding a constraint that s != 0 would break completeness, but not in any meaningful way
<sanket1729>
Ah, makes sense. I did not follow along completely.
<sipa>
what does completeness mean in this context?
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<sanket1729>
True, adding s!=0 would indeed break completeness
<sipa>
if you accidentally end up with s=0, pick a different nonce
<sipa>
you already need to do that if the nonce is out of range or 0, in practice
<nothingmuch>
is there any reason for the verifier to require that s != 0?
<sipa>
i don't think so
<sipa>
i think it's not a problem to support either
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<nothingmuch>
yep, on the prover side i think i will be adding that suggestion in the PR after the next one (Fiat-Shamir transform on top of this)
<nothingmuch>
thanks for the guidance, i'm reasonably happy, before i was doubting myself but 4 people seem to agree i'm not an idiot (well, about this one thing)
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