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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<maaku>
Unrelatedly, can anyone point me in the direction of a byzantine fault tolerent consensus algorithm that has received and survived peer review?
<maaku>
I actually have a blockchain related use case (not a replacement for proof of work!), but am having trouble finding something off the shelf
<maaku>
I have pretty much the same requirements as ripple/stellar -- user configurable quorum lists -- except in my use case it's actually okay to recognize that failures happen and to require human intervention
<maaku>
IBM's "Blockchain consensus in the wild" paints a pretty dismal picture.
<maaku>
The paper started so good and I anticipated getting to the end with a solid recommendation of the one or two systems that met their reasonable requirements. Instead it was a description of how everything fails :\
<JackH>
nice summary from Paxos and up to permissionless protocols though
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<pigeons>
stellar's current protocol stops advancing and requires human intervention in certain conditions
<pigeons>
ripple will continue broken and partitioned and incorrect
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<JackH>
Its nice they are mentioning traditional databases in that paper, like Kafka. A good paper with a great overview I would say
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<herzmeister[m]>
i'm pretty sure you can configure your 30 year old oracle database also properly, it's just one of those obscure features hardly anyone used, so you just have to get a good consultant
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<maaku>
amiller: can you explain why honeybadgerbft's reliance on eventual delivery of messages is sane in the presence of network attackers?
<Taek>
maaku: depends on how determined you are to get a message thorugh. Sneakernet messages are pretty hard to stifle, for example
<Taek>
but then you pay a latency price
<maaku>
In this use case I'm assuming the attacker has full network control and can do anything; drop messages; replay; reorder; etc.
<maaku>
It could be fine if doing so disrupts the BFT protocol, halting progress.
<maaku>
But it seems a little out of touch that HoneyBadgerBFT assumes reliable (if delayed) message transport in its analysis. Maybe I'm misunderstanding something about what that implies?
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<uiuc-slack>
<amiller> hey maaku! great questions....
<uiuc-slack>
<amiller> ultimately reliable message delivery is something you have to build on top of a unreliable network
<uiuc-slack>
<amiller> you basically just have to keep retrying messages until it gets through
<maaku>
I read that issue. It's not just bounded buffering I'm worried about, but what about out of order message delivery? or persistent (but selective) message dropping?
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<uiuc-slack>
<amiller> out of order message delivery is fine
<uiuc-slack>
<amiller> if an attacker is able to prevent all of the peers from getting messages across then there's no hope
<maaku>
amiller: could, say, an attacker perisistently prevent one peer from getting their proposals in the consensus set?
<uiuc-slack>
<amiller> honeybadgerbft is already explicitly designed to prevent selective delaying of messages from allowing censorship attacks
<uiuc-slack>
<amiller> okay so an attacker could persistently prevent one peer from getting their proposals in.... however, every peer maintains a txMempool, and if a tx is in every honest peers mempool, then the attacker cannot prevent that tx from getting included
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