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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<bsm117532>
Taek, adam3us: what are you guys getting at with pubkey retrieval? The v parameter is omitted in DER-encoded signatures, but it only has 2 possible values. So any signature only has two possible pubkeys, derivable from the signature. So the pubkey *is* generally retrievable from a signature.
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<bsm117532>
I've actually built an authentication system (ab)using this fact...
<nsh>
( <adam3us> an nsa guy twiddled with it enough claim no patent coverage and the resulting more complicated less flexible result was dsa # the are more cynical reasons for the NSA to make something more complicated and less flexible (and more fragile) other than patent considerations, sadly )
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<sipa>
bsm117532: bitcoin message signatures use that too
<sipa>
well, they do include the recovery id parameter
<nsh>
Taek, when you say "doomsday stuff" do you mean QC retroactively breaks ECC type scenarios or something more proximate?
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<Taek>
nsh: I do mean ECDSA is broken, either algorithmically or QC, or some other sort of adjustment to Bitcoin's fundamental security assumptions
* nsh
nods
<nsh>
pubkey hashes are preferable if there is no cost to aggregation. beyond that, it's a nontrivial cost:benefit analysis
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