#bitcoin-wizards on 2019-05-01 — irc logs at freenode.irclog.whitequark.org

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 | http://bitcoin.ninja/ | This channel is logged. | For logs and more information, visit http://bitcoin.ninja

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23:33 <gmaxwell> A fun (if not that useful) construct: Asymmetrically obese cryptography from non-interactive forward secrecy.

23:33 <gmaxwell> Generate a key-pair in a pairing group. Use it IBE style to generate private keys for "identities" corresponding to a counter. Fill your 100TB disk array with these keys. Save and publish the IBE master public key, destroy the master private key.

23:33 <gmaxwell> To encrypt, pick a random value, use it to random select a few hundred of the 'identities' at random, compute an ephemeral key with each of them and encrypt with that.

23:33 <gmaxwell> Now someone can't decrypt an arbitrary message without access to the big database (or the supposedly deleted master key), which is hard to steal due to its porcine proportions.

23:36 <pinheadmz> You give the random value over with the encrypted message? Why couldnt someone just derive keys at those precise indexes instead of regenerating the whole disk array?

23:37 <pinheadmz> oh wait, no master privkey duh

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23:49 <sipa> gmaxwell: lol, obese cryptography