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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<andytoshi>
nsh: appears they are suggesting doing PoW with a chameleon hash (a hash function with a backdoor) so that some trusted entity can rewrite blocks after the fact (and mine for free)
<andytoshi>
the whole thing is a confused mess, chameleon hashes are not optimization-free, doing redaction this way makes it impossible to tell which is the "original" and which is the "replacement" block, this allows long-after-the-fact double spending
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<Taek>
Seems like it'd be difficult to propagate the new block. How would you know if a chameleon block had been propagated, how would you handle the lightcone of transaction spending, what happens when the secret leaks, etc etc
<Taek>
preaching to the choir I guess
<Taek>
The paper seems to care more about redacting data than about reverting monetary transactions
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<NewLiberty>
Homomorphic always seemed like a trick with no pony.
<NewLiberty>
I could see how it could be useful for oracles, for zero knowledge multiparty computations, but there's no implementations. Now maybe there won't be.
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<NewLiberty>
Or at least need a new scheme for it,
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<bsm117532>
btcdrak: any thoughts on whether this has any bearing on to more common homomorphisms of exponentiation and elliptic curve point addition?
<bsm117532>
Those guys invented a new, and weird homomorphic encryption algorithm.
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<maaku>
Nothing in that article suggests an attack on homomorphic encryption itself, just the specific protocol.
<maaku>
I need to see the paper though.
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<maaku>
having read the paper it seems to defeat the specific homomorphic encryption scheme proposed by Zhou and Wornell in 2014
<maaku>
I have no idea how widely used that scheme is however.
<maaku>
It doesn't appear to be a weakness of pairing generally, but maybe I'm reading it wrong. Thoughts from andytoshi or gmaxwell would be appreciated
<andytoshi>
the zhou/wornell scheme is not pairing-based but works by multiplying vectors by secret matrices with noise
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<andytoshi>
there are a lot of "this could be used for cloud" advertisements and tons of magic numbers in the original paper, i can't tell what security it's actually claiming
<proslogion>
yeah, but it's the sort of crypto paper people like me like to read :)
<andytoshi>
but it is not too surprising to see it's broken (i think the authors would even agree, given that it appears they took a ring-LWE encryption scheme with a statistical security proof, extended it from binary to arbitrary ring vectors, and dropped the proof..)
<bsm117532>
maaku: Interesting...so they're using prime generating polynomials like n^2+n+41 (Euler) to optimize? I've been wondering if anyone was doing that, it only makes sense...
<andytoshi>
...and it has absolutely nothing at all to do with EC point addition or pedersen commitments
<proslogion>
of coz....
<proslogion>
i kinda wonder how did anyone who doesn't understand the difference between run of the mill HE and FHE hit upon that article...
<waxwing>
it was posted in theregister. surprised the headline didn't say "boffins crack encryption!" or something.
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