--- Log opened Wed Jan 27 00:00:27 2021
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09:05 < real_or_random> I was thinking about rescaling the z-coordinate of the accumulator point in ecmult_gen before every multiplication
09:05 < real_or_random> essentially this https://github.com/bitcoin-core/secp256k1/blob/98dac87839838b86094f1bccc71cc20e67b146cc/src/ecmult_gen_impl.h#L192 but before every multiplication
09:06 < real_or_random> (using randomness derived from secret key, or secret key/nonce, without keeping state.)
09:06 < real_or_random> do people think that's a good idea?
09:07 < real_or_random> related: https://github.com/bitcoin-core/secp256k1/pull/570
09:09 < real_or_random> this was also suggested by gmaxwell https://github.com/bitcoin-core/secp256k1/pull/767#issuecomment-679110697
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09:46 < sipa> real_or_random: what do you mean by "before every multiplication"? there is only one
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09:57 < sipa> real_or_random: you mean this as just extra blinding? or instead of using a constant-time algorithm?
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10:00 < sipa> the difference between constant time and variable is also a lot smaller now in the latest safegcd code... around a factor 1.5 if we use hddivsteps, so i don't think that's worth it for that anymore
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11:09 < real_or_random> sipa: yeah, I mean before the one multiplication ^^ at the moment we only do it once per context rerandomization
11:10 < real_or_random> sipa: inversion: yes, i saw your comment on github. this matches my thoughts, maybe it's still worth to do the blinding with the constant-time algorithm
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13:24 < sipa> real_or_random: i'm a bit confused what the "it" is you refer to
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--- Log closed Thu Jan 28 00:00:28 2021