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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<Dizzle> gmaxwell yes, pretty funny (:
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<nicolagreco> is there an encryption scheme where it is very time consuming to encrypt? a sort of reverse time lock?
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<runeks> Is relative lock-time in effect yet? As far as I can see, it isn't, but I'm not quite sure.
<runeks> nicolagreco: Require the would-be encrypter to "mine" the AES key from some data that you provide. Example: Provide the encrypter with a random 32-byte string. Tell him to append a uint64-nonce to the end of this string and keep incrementing it, until the hash of the whole thing starts with X number of zeros. When he's found this hash he notes the nonce, and
<runeks> encrypt the message using the hash as an AES key, and appends the original 32-byte string plus the uint64-nonce to the end of the encrypted data . To decrypt: 1) hash 32-bytes+nonce and confirm that it starts with X number of zeros 2) convert hash to AES key and decrypt message.
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<gmaxwell> runeks: we've had relative locktime for well over a year.
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<runeks> gmaxwell: Great! Thanks.
<runeks> gmaxwell: Would that be BIP68?
<gmaxwell> yes.
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<runeks> So, on the BIPS page https://github.com/bitcoin/bips should "Final" be viewed as "In effect" (accepted by miners if it's a soft fork)?
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<gmaxwell> yes.
<runeks> thank you Sir
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<FoxFoxDay> PBOC Dump coming guys Bitcoin going to drop hard check this chart http://www.edgeles.io/#bitcoin-chart
<kanzure> wrong channel
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<gmaxwell> market manipulatning spammers know no topicality bounds.
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<grubles> that is malware dont click
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<kanzure> "I know this isn't a preimage attack, because none are known yet and they would probably not be announced as a GIF. "
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<gmaxwell> yea, the animated gif? it's constructed using MD extensions of a collision attack.
<gmaxwell> basically you make a multiway collision over different digits... and use a embedded comment to hide the collision data. then chain along to the next digit and do it again. At the end you have a file which you can subsitute in any value for any digit and keep the same hash.
<gmaxwell> it only works because the format lets you insert comment blocks filled with arbritary junk.