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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<FNinTak>
XOF would be useful for very large merkle trees b/c colliding nodes close to the root is increasingly easy...if the tree is fixed or bounded size the sizes at intermediate nodes could be part of the spec
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<Taek>
FNinTak: how would you search for a collision on the root nodes in a way that is faster than scanning for a collision on a single hash?
<Taek>
*close-to-root nodes
<Taek>
collision attacks happen by generating a huge number of hashes and comparing them against eachother
<Taek>
trees are generally very small relative to one's ability to produce massive tables of hashes
<Taek>
so I would think that collision resistance of a tree is roughly equal to collision resistance of a single hash
<Taek>
(identical in terms of order notation)
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<FNinTak>
Taek: You can find a colliding subtree easily as the size of the subtree increases was my point - the fixed-length hash means you lost information about the tree, which is more relevant as your tree expands.
<FNinTak>
In the Bitcoin case this definitely isn't relevant - but a tree over all transactions may be affected
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<uiuc-slack>
<amiller> @MaxSan, which spam?
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