2015-10-30 00:53
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 |
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00:09
<
gmaxwell >
It's not clear to me why multiplying would ever be more attractive. If the scalar you multiply by has low multiplicative order, I don't think you even get a uniform point out. Multiplying is also enormously slower-- which is a concern if you need to enumerate many keys.
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00:10
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gmaxwell >
oleganza: careful too, I've seen something confuse adding and multiplying because of markup that uses addition vs multiplication for the group operation.
00:11
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oleganza >
haha. That's a mess, indeed
00:11
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oleganza >
gmaxwell: thanks for your reply to [curves]
00:12
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gmaxwell >
oleganza: it was kinda offtopic. But I dunno, I think the ed25519 and sybling curves are interesting and nice but their advantages are overhyped and their weaknesses ignored. I always feel stupid complaining about it.
00:13
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oleganza >
i noticed that a proportion of cargoculting and confusion to actual reasoning is 10:1.
00:13
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gmaxwell >
I think anyone trying to do hierarchical keys with 25519 are going to have a bad time, no matter what you do you'll find the resulting keys incompatible with some software.
00:13
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oleganza >
that's me, right now
00:14
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oleganza >
btw, why the "chain code" is called "chain code"?
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00:14
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gmaxwell >
I had a conversation about this with DJB a while ago, and his remark was you can just fix things to make it work, e.g. eliminate the high bit requirement, multiply by the cofactor. Which is true and all but it breaks things, in non-trivial ways.
00:14
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gmaxwell >
oleganza: maybe sipa remembers.
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gmaxwell >
I can imagine implementations removing the high bit requirement and then mishandling infinity in the addition function... but not noticing it because of pretty good odds of test vectors passing.
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gmaxwell >
oleganza: in the curve25519 montgomery stuff perhaps, but common ed25519 implementations need their multiply to handle it. Unless my memory is entirely wrong (maybe is), donna demands the most significant bit of the scalar to be set for the xG used for pubkey generation, because the underlying 'constant time' point addition lacks the conditional move to handle infinity.
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gmaxwell >
and, of course, even one widely used implementation making use of that optimization means you're in for a world of compatiblity issues.
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Chris_Stewart_5 >
al/exit
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06:53
<
fluffypony >
gmaxwell: re: crowdsales, that's pretty much why the SEC needs to make an example of
*some* ICO
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