2014-11-28.log

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nnnmI'm looking at blockchain.info block explorer now. There seem to be weird block distribution in the recent hour. Is that usual?04:21
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gmaxwell(1) bc.i data is very frequently totally wrong and busted, (2) what do you think is weird? ... blocks gaps are exponential, they ofen look bursty.04:23
nnnmI was sure that with Bitcoin's hashrate it is practically impossible to have 40-min gap04:24
gmaxwell;;tblb 240004:24
gribbleThe expected time between blocks taking 40 minutes and 0 seconds to generate is 8 hours, 53 minutes, and 40 seconds04:24
gmaxwellnnnm: try more like 2.6 times per day on average.04:25
nnnmok great thank you04:25
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kanzure"There is a subdirectory named ".protagonist/tags", and a subdirectory ".protagonist/tags/t" for every existing tag, t. Any file which is tagged with t is given a unique identifier and a hard link in the directory t."05:44
kanzurei dunno about this...05:44
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oakpacific;;tblb 360006:45
gribbleThe expected time between blocks taking 1 hour and 0 seconds to generate is 2 days, 21 hours, 40 minutes, and 58 seconds06:45
oakpacific;;tblb 3600006:45
gribbleAn error has occurred and has been logged. Please contact this bot's administrator for more information.06:45
oakpacific;;tblb 720006:45
gribbleThe expected time between blocks taking 2 hours and 0 seconds to generate is 3 years, 18 weeks, 1 day, 13 hours, 35 minutes, and 3 seconds06:45
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HMhmm08:23
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kanzure.tw https://twitter.com/zooko/status/53839214812765798414:51
yoleaux@petertoddbtc Challenge: key generation alg with entirely analog, homebuilt components: marbles, blocks, paper, rubber bands, etc. (@zooko, in reply to tw:538391798763118592)14:51
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gmaxwellkanzure: if we want to be all secret decoder ring about it, here is what we do.16:04
kanzurei don't know which it we're talking about, but i'm listening16:05
zookome neither and me too!16:05
gmaxwellthe tweet.16:05
kanzureoh that's way less interesting than what i was hoping we were talking about16:05
kanzurei am going to proceed with my prior assumptions then16:05
nshthere was a paper that suggested you can do ECC in 400 bytes of RAM but it's in Springerjail16:06
gmaxwellYou generate your secret and a second random value.  By hand you sum your secret and the random value. Now take your secret+random and your random value to seperate computers and compute x*G  for each. then do the single point addition by hand to get your pubkey. :P16:06
nsh(bytes of RAM being roughly commensurate to 'moving parts' in some mechanical system)16:06
zookogmaxwell: huh!16:07
gmaxwellthe first addition is plain integer addition mod order, which is trivial.  The point addition requires something like 8 field operations, so it's going to take you a while by hand. :P16:07
gmaxwellbut its completely reasonable and I assume you could do it in under an hour.16:07
* nsh would like to see some abacus pros doing ECC16:07
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kanzurensh: you mean springerkink16:08
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* nsh nods16:08
kanzurewhy isn't the tor onion routing stuff a separate library? i don't see why it has to be tor-only code.16:08
nsh.title http://crypto.stackexchange.com/questions/8747/how-to-build-an-electro-mechanical-public-key-cipher-machine16:09
yoleauxhistoric - How to build an electro-mechanical public key cipher machine? - Cryptography Stack Exchange16:09
gmaxwellkanzure: it's not usefully abstractable.16:09
kanzurethis stuff over here: https://gitweb.torproject.org/tor.git/blob_plain/HEAD:/src/or/circuitbuild.c16:09
sipa8 field operations? how fast does a human do a 512-bit by 256-bit division...?16:10
sipaoh; field; if it's secp256k1 there's an easier way to do a modulus16:10
gmaxwellyea.16:10
gmaxwellwell you can use repeated subtraction to do the reduction instead of division in any case.16:11
nsh" I wonder if you could implement ECC in hardware? Have a flexible line defined by the equation to serve as a cam surface, then place a straightedge at points P and Q to find the intersecting point. It could be a great illustrative tool, but I doubt it could be made accurate enough to provide the security required. –  John Deters Jun 17 '13 at 16:50 "16:11
nshthat's zooko-worthy crazebition :)16:11
zookoHaha16:11
kanzurecc kragenjaviersitaker16:11
gmaxwellnsh: lol thats goofy, ECC over Fp^n is only conceptually related to ec over reals... in particular discrete log for ec on reals is not hard.16:12
nshright16:12
nshbut perhaps you can shift the quantization?16:12
nshnot sure that makes any sense16:13
sipansh: http://bitcoin.stackexchange.com/questions/21907/what-does-the-curve-used-in-bitcoin-secp256k1-look-like16:13
gmaxwellsipa: also you can get a pubkey in jacobian, and just have a computer reduce it to affine, as thats easy to check.16:13
zookoSo, FWIW, I was imagining a hash function instead of "public key". :-)16:19
sipansh: heh, i wonder how much ram my implementation of secp256k1 uses at most (excluding the precomputed tables)16:20
gmaxwellah people have done sha256 by hand. (sha256^2 in fact)16:20
nshhmm16:20
nshis there a limit to processing/ram tradeoff particular to a given algorithm/calculation?16:21
nshie, generally you can use less state at the expense of longer processing but only to a point16:21
nshhow does that point depend on the intrinsics of the calculation?16:21
sipaoh, for verification some factors are converted to wNAF form, which takes 4*129 bytes16:22
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gmaxwellnsh: there really is no limit for the s*G task, though obviously you run out of fast ram at some point.  For the a*G + b*P multiexp, where only G is a constant base that you use over and over again and P you only use once, there is a small optimal amount of table to use.16:25
nshhmm16:25
gmaxwell(the multiexp is what signature verification is doing; P is the pubkey)16:25
* nsh nods16:26
gmaxwellFor the multiply with a generator case, it basically always gets faster with a bigger table if you're assuming memory bandwidth is infinite.16:26
sipalatency you mean16:26
sipaah, for signing; never mind16:27
gmaxwellon i4770r which has a 128mb L4 cache. I get the best performance for multiply with a constant point using a 70mbyte-ish table.16:27
nshif we're aiming for something like an abacus that can be used by a trained human with good manual dexterity at 'reasonable' speed16:27
nshthere will be some optimum degree of mechanical/state complexity16:28
gmaxwellwell for e.g. generate a pubkey, if you're allowed a book you want the most precomputation possible.16:28
* nsh nods16:29
gmaxwelle.g. a book with 65536 entries lets you do the whole multiply yourself with only 16 point additions.16:29
* nsh wonders about an ECC precomp slide-rule type device16:29
nshbooks are suboptimal for hand-based look-up, really16:29
gmaxwellthey can have tabs.16:29
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* nsh nods16:30
zookosorry -- I'm playing Thunderstone in real life with my brother Nathan and my 10yo son. :-)16:35
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rustygmaxwell: is there a canonical writeup on UTXO commitments somewhere?  I can only find scattered references...16:40
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phantomcircuitgmaxwell, i have done the first 3 and the last 3 stages of sha256 by hand16:59
phantomcircuit0/10 would not recommend16:59
gmaxwellrusty: no, sprawling discussions, maaku's work is probably the most sophicated.17:00
gmaxwellI think maaku is not around today or I'd ping him for links.17:00
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zookophantomcircuit: haha18:37
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amillerrusty, i have a paper and an ocaml library that makes authenticated data structure protocols for any data structure https://amiller.github.io/lambda-auth/18:52
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amillerrusty, i have a forum post, https://bitcointalk.org/index.php?topic=101734.0 etotheipi has one https://bitcointalk.org/index.php?topic=88208.0 maaku has one https://bitcointalk.org/index.php?topic=204283.0 petertodd has an implementation too https://github.com/petertodd/python-merbinnertree18:57
amilleri think all of those are the best references... not *too* scattered18:58
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rustyamiller: thanks!  Reading now...19:23
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