2016-08-10.log

--- Log opened Wed Aug 10 00:00:21 2016
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proslogionhmmm, looks like the MW  r value can be made information theoretically secure before spending?01:03
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proslogionmeh, kinda pointless, if you break ECDLP you can just use a r for any amount you want to spend from any output01:21
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nshproslogion, there is benefit to making the blinding information-theoretically secure, but the security will still rest on DLP03:02
nshi would rather try to fix MW so we can recover the range-proof as secret data03:02
nshthat's a wonderful feature of CT imho03:03
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kanzure"Bootstrapping for HElib" http://eprint.iacr.org/2014/873.pdf07:59
kanzureCVE-2016-5696 and "Off-path TCP exploits: Global rate limit considered dangerous" https://www.usenix.org/system/files/conference/usenixsecurity16/sec16_paper_cao.pdf08:00
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kanzure.title https://www.youtube.com/watch?v=S4Ns5wla9DY08:29
yoleauxPure Off-path TCP attack demo by using a side channel in Recent Linux Kernel - YouTube08:29
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cjdis there anything going on at the moment regarding spam in the mempool ?10:09
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@gmaxwellcjd: thats a really vague question.10:11
@gmaxwellmempool is memory limited now, so no one cares about mempool spam anymore.10:12
cjdok, I'm just hearing a bunch of stuff from people using bitfinex that they can't make transactions happen based on the blockchain itself10:13
cjdif you're not seeing anything anomalous then it's just people not putting enough fees...10:13
@gmaxwellcjd: or they're rate limiting withdrawls?10:13
cjd*basically they have transactions hitting the mempool but not getting mined10:14
cjdboth trying to withdraw and deposit10:14
cjdBut I trust you have alarm bells setup and if you don't see anything then there is nothing to see10:14
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kanzure"Investigating the origins of RSA public keys" https://www.usenix.org/conference/usenixsecurity16/technical-sessions/presentation/svenda12:51
kanzure"Can bits of an RSA public key leak information about design and implementation choices such as the prime generation algorithm? We analysed over 60 million freshly generated key pairs from 22 open- and closedsource libraries and from 16 different smartcards, revealing significant leakage. The bias introduced by different choices is sufficiently large to classify a probable library or smartcard with high accuracy based only on the ...12:51
kanzure... values of public keys. Such a classification can be used to decrease the anonymity set of users of anonymous mailers or operators of linked Tor hidden services, to quickly detect keys from the same vulnerable library or to verify a claim of use of secure hardware by a remote party. The classification of the key origins of more than 10 million RSA-based IPv4 TLS keys and 1.4 million PGP keys also provides an independent estimation ...12:51
kanzure... of the libraries that are most commonly used to generate the keys found on the Internet."12:51
kanzureoh... they are in austin this year.12:53
kanzure... right now... huh. i should head over.12:53
kanzureanyone want to sponsor the ticket fee for me?12:54
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kanzurefor wordtypes12:59
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kanzure"ZKBoo: Faster Zero-Knowledge for Boolean Circuits" https://www.usenix.org/conference/usenixsecurity16/technical-sessions/presentation/giacomelli13:03
kanzure"The Cut-and-Choose Game and Its Application to Cryptographic Protocols" https://www.usenix.org/conference/usenixsecurity16/technical-sessions/presentation/zhu13:03
kanzurewould be good to capture most of these --> https://www.usenix.org/conference/usenixsecurity16/technical-sessions13:09
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roasbeefthe list of accepted papers for CCS is up: https://www.sigsac.org/ccs/CCS2016/accepted-papers/, there're a few cryptocurrency related papers that were accepted13:16
roasbeefone that jumps out (based solely off the title) is: "A Secure Sharding Protocol For Open Blockchains", though I can't find a draft of it anywhere atm13:16
@gmaxwellhttps://github.com/Sobuno/ZKBoo13:18
@gmaxwelllol academic code13:19
@gmaxwell$ ./m13:20
@gmaxwellEnter the string to be hashed (Max 55 characters): test13:20
@gmaxwellString length: 413:20
@gmaxwellIterations of SHA: 13613:20
@gmaxwell*** buffer overflow detected ***: m terminated; report to <http://bugs.gentoo.org/>13:20
@gmaxwellbut ignoring the crashyness, they get major kudos for having a trivial to use demo.13:21
@gmaxwellI've got it working.13:21
kanzureshould i head over? hard to decide.   looks like they do eventually publish videos.13:22
kanzurebut i'm not sure if they publish videos of all sessions.13:22
Alaniusthey do record13:23
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kanzurethanks. no need for me to go pester them, then...13:24
Alaniusyeah, last year's videos are all up13:25
kanzurei saw about 15 videos but i see much more than 15 sessions listed13:25
Alaniusare we looking at the same webpage? I am looking at this: https://www.usenix.org/conference/usenixsecurity15/technical-sessions13:26
kanzurehttps://www.youtube.com/playlist?list=PLbRoZ5Rrl5lfeRixThHzgGYj1wu80JOh313:26
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kanzureoh you're right. the videos are on each page.13:27
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@gmaxwellThis is a cute approach.13:29
kanzurewhat, crashing?13:29
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nshas a black box construction it shouldn't matter the relationship between the two generators in an EC pederson commitment scheme, so long as DLP of one is not known with respect to the other, but i'm sure that there must exist mutually weak points15:24
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nsh(as there are weak curves for various types of attack)15:25
nsh*DL15:25
sipawhat are weak points?15:27
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nshunsure, i just have a feeling that any point cannot be equally secure as a second generator15:32
nshmathematics generally declines to be that boring15:32
@gmaxwellall generators are equal in curves like secp256k1.15:33
@gmaxwellImagine if you have alternative generator Q where discrete log wrt Q is somehow easy.  Now you find the DL of G with respect to Q... then you can transfer problem of finding P wrt G by multiplying P by the ratio of the two generators to make it problem of finding the DL of some other point with respect to Q.15:35
nshoh, right15:35
sipagmaxwell: you mean "all points are generators" - any generator is by definition as good as any other generator, but there are curves which have points that are not generators15:36
nshhardness uniform throughout the group because it's multiplicatively constant15:36
nsh+is15:36
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nshcan we not use Schnorr authentication and godel numbering to do arbitrary expressions in zero knowledge?15:42
nshreally you want to prove that you know something that matches an arbitrary expression, which is another thing to proving you can formulate an arbitrary expression15:45
sipagodel numbering doesn't preserve the semantics of the language15:45
* nsh nods15:45
nshdoesn't necessarily. you can apply certain prescriptive numberings that preserve some properties15:46
sipafeel free to try15:46
andytoshiwell mapping numbers to points by x → xG preserves addition. but not multiplication. you'd need to do both at once somehow15:47
andytoshiand given that your group only has one operation..15:47
sipaand any other operations the expression language has15:47
andytoshii think polynomial circuits are fully general, if you can add and multiply you can do small programs at least15:47
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proslogionspeak of that, anyone knows in general how difficult is the subgroup membership problem? like comparing to DLP?15:49
proslogionsay i have a random number, i want to find out if it has a discrete log with generator g15:50
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sipaproslogion: testing whether it belongs to a subgroup of a given size (or divisor thereof) is easy15:51
proslogionsipa: with a particular generator?15:55
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sipaproslogion: not afaik15:55
sipaor not in general at least15:55
sipaif you know there is only one generator of a certain order it is easy :)15:56
proslogionlol15:56
sipathat's not unusual15:57
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nshgmaxwell, what's the actual logical form of the statement proved in the rangeproof implementation? something about a bunch of digits base 4 and a mantissa?17:39
sipait proves that the commitment equals some number times G plus a number in the range [0..2^32-1] multiplied by H, without revealing either17:40
sipathe range is configurable17:40
nshyeah, but it actually proves a statement based around a deconstruction of the value in some weird way17:41
nshor maybe i misunderstood something17:42
sipayes, you pick some random points C0, C1, C2, ..., whose sum equals the commitment C17:44
sipafor each of them you pick 2 bits of the value, so v0 + 4*v1 + 16*v2 + ... = value17:45
* nsh nods17:45
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sipathen you reveal C0 + v0*H, C1 + 4*v1*H, C2 + 16*v2+H, ...17:46
sipayou call those C0', C1', C2', ...17:46
nshhmm17:47
sipathen for C0', it is true that you know the DLP for either C0' (if v0==0), C0'-H (if v0==1), C0'-2H (if v0==2) or C0'-3H (if v0==3)17:47
sipa(that DLP is just the DLP of C0)17:47
sipaso you give a ring sig of the message with the 4 pubkeys (C0', C0'-H, C0'-2H, C0'-3H)17:47
* nsh nods17:48
sipawhich reveals you know the DLP for either of those, but not which one17:48
sipathen you do the same for C1', you know the DLP for either C1', C1'-4H, C1'-8H, C1'-12H17:48
sipaetc17:48
nshright17:48
nshty17:49
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Cloudflaremryandao is not a proper bitcoin wizard19:08
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kanzurehttp://manishearth.github.io/blog/2016/08/10/interactive-sudoku-zero-knowledge-proof/21:58
kanzure( https://news.ycombinator.com/item?id=12260018 )21:58
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