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http://znc.sourceforge.net] 08:02 -!- jb55 [~jb55@gateway/tor-sasl/jb55] has quit [Remote host closed the connection] 08:02 -!- luke-jr [~luke-jr@unaffiliated/luke-jr] has joined #bitcoin-wizards 08:03 -!- jb55 [~jb55@gateway/tor-sasl/jb55] has joined #bitcoin-wizards 08:08 -!- shush [~pawn@cpe-76-176-137-0.san.res.rr.com] has joined #bitcoin-wizards 08:17 -!- proofofkeags [~proofofke@174-29-8-246.hlrn.qwest.net] has joined #bitcoin-wizards 08:20 -!- alferz [~alferz@unaffiliated/alfer] has quit [Ping timeout: 240 seconds] 08:20 -!- shush [~pawn@cpe-76-176-137-0.san.res.rr.com] has quit [Remote host closed the connection] 08:20 -!- t-bast [~t-bast@2a01:e34:efde:97d0:fdf3:86be:1144:ad96] has quit [Quit: Leaving] 08:21 -!- shush [~pawn@2605:e000:1c03:824a:15a1:db60:887f:ace3] has joined #bitcoin-wizards 08:21 -!- proofofkeags [~proofofke@174-29-8-246.hlrn.qwest.net] has quit [Ping timeout: 240 seconds] 08:21 -!- hari1 [~hari@184.75.221.211] has joined #bitcoin-wizards 08:25 -!- alferz [~alferz@unaffiliated/alfer] has joined #bitcoin-wizards 08:26 -!- shush [~pawn@2605:e000:1c03:824a:15a1:db60:887f:ace3] has quit [Ping timeout: 260 seconds] 08:28 -!- proofofkeags [~proofofke@174-29-8-246.hlrn.qwest.net] has joined #bitcoin-wizards 08:29 -!- jonatack [~jon@2a01:e0a:53c:a200:bb54:3be5:c3d0:9ce5] has joined #bitcoin-wizards 08:32 -!- alferz [~alferz@unaffiliated/alfer] has quit [Ping timeout: 240 seconds] 08:38 -!- arowser_ [~arowser1@192.69.88.248] has quit [Remote host closed the connection] 08:39 -!- arowser_ [~arowser1@192.69.88.248] has joined #bitcoin-wizards 08:54 -!- shush [~pawn@2605:e000:1c03:824a:15a1:db60:887f:ace3] has joined #bitcoin-wizards 09:00 -!- proofofkeags [~proofofke@174-29-8-246.hlrn.qwest.net] has quit [Remote host closed the connection] 09:00 -!- proofofkeags [~proofofke@174-29-8-246.hlrn.qwest.net] has joined #bitcoin-wizards 09:01 -!- GuthL [1f9a4bda@gateway/web/cgi-irc/kiwiirc.com/ip.31.154.75.218] has joined #bitcoin-wizards 09:02 < GuthL> Does anyone know a way to provably leak a key on Bitcoin? Meaning a bitcoin script where to unlock the UTXO, Alice must 09:02 < GuthL> - Provide a signature from her address 09:02 < GuthL> - Provably leak an another private key on secp 09:02 < GuthL> Bob is aware of Alice address and the ephemeral public key 09:03 < zmnscpxj__> Scriptless Script, there are many variants of this 09:03 < zmnscpxj__> Basically given an (R, s) scheme, where s = r + h(P|R|m) * a, you can create an "adaptor signature" 09:04 < zmnscpxj__> Where you have R = R' + T, where T is the pubkey whose privkey Alice promises to leak 09:04 < zmnscpxj__> THen you can provide an "adaptor" s[adaptor] = r' + h(P|(R'+T)|m) * a 09:05 < GuthL> The idea I'm going after is definitely a scriptless script. 09:05 -!- proofofkeags [~proofofke@174-29-8-246.hlrn.qwest.net] has quit [Ping timeout: 256 seconds] 09:05 < GuthL> Thanks a lot! Do you have a link for later reference? 09:05 < zmnscpxj__> Then completion of the signature s = r' = t + h(P|R'+T|m) * a 09:05 < zmnscpxj__> hmmmm not out of hand but maybe searching joinmarket.me blog for scriptless script will start you up 09:05 < zmnscpxj__> what I describe is for Schnorr signatuers 09:06 < zmnscpxj__> there have been Scriptless Script things that have been developed for a 2-party ECDSA as well 09:06 < zmnscpxj__> and maybe more 09:07 < GuthL> I'm looking for 2-party ECDSA mechanism. It relates to a cross-chain atomic swap. 09:07 < zmnscpxj__> trying looking in the lightning-dev mailing list archives, I think there was one a year or two ago, haha cannot remember years 09:08 < zmnscpxj__> tho the joinmarket.me blog might have some recent posts on 2p ECDSA 09:08 < zmnscpxj__> also consider looking up the recent discussion on Succinct Atomic Swap on bitcoin-dev, about a month or two ago 09:08 < zmnscpxj__> Which suggests a small atomic cross-system swap 09:09 < GuthL> I found this: https://diyhpl.us/wiki/transcripts/scalingbitcoin/tokyo-2018/scriptless-ecdsa/ 09:09 < zmnscpxj__> that might work 09:09 < zmnscpxj__> tho see the Succinct Atomic Swap posts on bitcoin-dev mailing list as well 09:11 < GuthL> I imagine you are referring to this: https://gist.github.com/RubenSomsen/8853a66a64825716f51b409be528355f 09:11 < zmnscpxj__> yes 09:11 < GuthL> Perfect! Thanks a lot. 09:12 -!- GuthL [1f9a4bda@gateway/web/cgi-irc/kiwiirc.com/ip.31.154.75.218] has quit [Quit: http://www.kiwiirc.com/ - A hand crafted IRC client] 09:12 -!- GuthL [1f9a4bda@gateway/web/cgi-irc/kiwiirc.com/ip.31.154.75.218] has joined #bitcoin-wizards 09:15 -!- justanotheruser [~justanoth@unaffiliated/justanotheruser] has quit [Ping timeout: 244 seconds] 09:21 -!- arowser_ [~arowser1@192.69.88.248] has quit [Remote host closed the connection] 09:21 -!- arowser_ [~arowser1@192.69.88.248] has joined #bitcoin-wizards 09:22 -!- GuthL [1f9a4bda@gateway/web/cgi-irc/kiwiirc.com/ip.31.154.75.218] has quit [Quit: http://www.kiwiirc.com/ - A hand crafted IRC client] 09:22 -!- GuthL [1f9a4bda@gateway/web/cgi-irc/kiwiirc.com/ip.31.154.75.218] has joined #bitcoin-wizards 09:22 -!- TheoStorm [~TheoStorm@78-22-87-51.access.telenet.be] has joined #bitcoin-wizards 09:23 -!- GuthL [1f9a4bda@gateway/web/cgi-irc/kiwiirc.com/ip.31.154.75.218] has quit [Client Quit] 09:23 -!- TheoStorm [~TheoStorm@78-22-87-51.access.telenet.be] has quit [Client Quit] 09:36 -!- jeremyrubin [~jr@2601:645:c200:f539:bd98:3c2c:9403:b8b3] has joined #bitcoin-wizards 09:46 -!- laptop [~laptop@89.44.42.100] has quit [Ping timeout: 256 seconds] 09:46 -!- justanotheruser [~justanoth@unaffiliated/justanotheruser] has joined #bitcoin-wizards 10:13 -!- vtnerd [~vtnerd@173-17-206-92.client.mchsi.com] has joined #bitcoin-wizards 10:16 < RubenSomsen> GuthL: feel free to ping me if you have any questions about SAS 10:22 -!- troygiorshev [~troygiors@CPEdcef09a0ed55-CM0c473d74be00.cpe.net.cable.rogers.com] has quit [Quit: leaving] 10:25 -!- troygiorshev [~troygiors@CPEdcef09a0ed55-CM0c473d74be00.cpe.net.cable.rogers.com] has joined #bitcoin-wizards 10:30 -!- luke-jr [~luke-jr@unaffiliated/luke-jr] has quit [Quit: ZNC - http://znc.sourceforge.net] 10:30 -!- luke-jr [~luke-jr@unaffiliated/luke-jr] has joined #bitcoin-wizards 10:42 -!- Cloudflare_ [~Cloudflar@unaffiliated/cloudflare] has joined #bitcoin-wizards 10:44 -!- Cloudflare [~Cloudflar@unaffiliated/cloudflare] has quit [Ping timeout: 246 seconds] 10:44 -!- Cloudflare_ is now known as Cloudflare 10:46 -!- GuthL [5dac457c@gateway/web/cgi-irc/kiwiirc.com/ip.93.172.69.124] has joined #bitcoin-wizards 11:00 -!- hari1 [~hari@184.75.221.211] has quit [] 11:04 -!- GuthL [5dac457c@gateway/web/cgi-irc/kiwiirc.com/ip.93.172.69.124] has quit [Quit: http://www.kiwiirc.com/ - A hand crafted IRC client] 11:04 -!- GuthL [5dac457c@gateway/web/cgi-irc/kiwiirc.com/ip.93.172.69.124] has joined #bitcoin-wizards 11:05 -!- GuthL [5dac457c@gateway/web/cgi-irc/kiwiirc.com/ip.93.172.69.124] has quit [Client Quit] 11:07 -!- proofofkeags [~proofofke@174-29-8-246.hlrn.qwest.net] has joined #bitcoin-wizards 11:10 -!- GuthL [5dac457c@gateway/web/cgi-irc/kiwiirc.com/ip.93.172.69.124] has joined #bitcoin-wizards 11:10 -!- GuthL [5dac457c@gateway/web/cgi-irc/kiwiirc.com/ip.93.172.69.124] has quit [Client Quit] 11:28 -!- davispuh [~quassel@81.198.237.79] has joined #bitcoin-wizards 11:28 -!- proofofkeags [~proofofke@174-29-8-246.hlrn.qwest.net] has quit [Remote host closed the connection] 11:29 -!- rafalcpp [~racalcppp@ip-178-214.ists.pl] has quit [Ping timeout: 246 seconds] 11:44 -!- rafalcpp [~racalcppp@ip-178-214.ists.pl] has joined #bitcoin-wizards 11:55 -!- Dimlock [~Dimlock@89.47.234.28] has joined #bitcoin-wizards 11:57 -!- CryptoDavid [uid14990@gateway/web/irccloud.com/x-cqpvxyirjosmkykh] has quit [Quit: Connection closed for inactivity] 12:11 < roconnor> If you want to provably leak a private key on Bitcoin Script today I think it suffices to demand a signtature that is very small in size, which can be enforced with OP_SIZE and OP_LT an friends. 12:12 < roconnor> A small sized signature essentially forces R to be +/- G/2 and hence forces k to be +/- 1/2 and then knowledge of k allows you to recover the private key from the signature. 12:15 -!- proofofkeags [~proofofke@174-29-8-246.hlrn.qwest.net] has joined #bitcoin-wizards 12:15 < roconnor> Technically this can be circumvented by a using a vast amount of computing power to find another R value that is just as small as G/2. I understand that require about 2^90 work. 12:16 < roconnor> (which is comperable to the total amount of PoW done in Bitcoin). 12:19 < aj> roconnor: you can circumvent it by pre-calculating a small R and changing the message to also get a small s, for 2*2^45 work or something, i think? 12:26 < roconnor> The message is hashed so it takes "just as much" work to grind a small s as it is to grind a small r. 12:27 < roconnor> You can define the signature and message first and use pubkey derivation to derive the public key for it. 12:28 < roconnor> but that requires knowing the message first, and usually in Bitcoin the message contains the pubkey. 12:28 < roconnor> (you'd want to make sure they aren't doing any CODESEPARATOR shenanigans here.) 12:32 < roconnor> aj: oh I see you grind r and s separately! 12:32 < roconnor> I don't know what I was thinking 12:32 < roconnor> Yes you are right. 12:33 -!- shush [~pawn@2605:e000:1c03:824a:15a1:db60:887f:ace3] has quit [Remote host closed the connection] 12:34 -!- shush [~pawn@2605:e000:1c03:824a:15a1:db60:887f:ace3] has joined #bitcoin-wizards 12:35 < roconnor> too bad we don't have high-S consensus rules. 12:39 -!- shush [~pawn@2605:e000:1c03:824a:15a1:db60:887f:ace3] has quit [Remote host closed the connection] 12:39 -!- shush [~pawn@2605:e000:1c03:824a:15a1:db60:887f:ace3] has joined #bitcoin-wizards 12:44 < aj> roconnor: yeah (talked about this with gmaxwell back 2015ish when thinking about it for lightning) 12:44 -!- rusty [~rusty@pdpc/supporter/bronze/rusty] has joined #bitcoin-wizards 12:45 < aj> roconnor: i think it might have been possible then to require setting r=g/2 and grinding s a little bit to make it roughly infeasible to grind both r and s and get the same result, not sure if that'd still work, and it seemed like too much effort at that point 12:54 -!- rusty [~rusty@pdpc/supporter/bronze/rusty] has left #bitcoin-wizards [] 13:00 -!- arowser_ [~arowser1@192.69.88.248] has quit [Remote host closed the connection] 13:01 -!- arowser_ [~arowser1@192.69.88.248] has joined #bitcoin-wizards 13:04 -!- TheoStorm [~TheoStorm@78-22-87-51.access.telenet.be] has joined #bitcoin-wizards 13:07 -!- wk057 [~wk@unaffiliated/wizkid057] has quit [Read error: Connection reset by peer] 13:12 -!- TheoStorm [~TheoStorm@78-22-87-51.access.telenet.be] has quit [Quit: Leaving] 13:13 -!- wk057 [~wk@unaffiliated/wizkid057] has joined #bitcoin-wizards 13:27 -!- justanotheruser [~justanoth@unaffiliated/justanotheruser] has quit [Ping timeout: 240 seconds] 13:31 -!- proofofkeags [~proofofke@174-29-8-246.hlrn.qwest.net] has quit [Remote host closed the connection] 13:31 -!- proofofkeags [~proofofke@174-29-8-246.hlrn.qwest.net] has joined #bitcoin-wizards 13:32 -!- proofofkeags [~proofofke@174-29-8-246.hlrn.qwest.net] has quit [Remote host closed the connection] 13:32 -!- proofofkeags [~proofofke@174-29-8-246.hlrn.qwest.net] has joined #bitcoin-wizards 13:35 -!- Guyver2 [Guyver@guyver2.xs4all.nl] has quit [Quit: Going offline, see ya! (www.adiirc.com)] 13:38 < waxwing> for reference the recent stuff about single-signer ecdsa adaptor signature (links to Fournier's paper amongst other things): https://joinmarket.me/blog/blog/schnorrless-scriptless-scripts/ 13:39 < waxwing> i think it's a better setup for an ecdsa atomic swap than what we had before, only because it's a lot less crypto machinery. but i think the drawback is you use on-chain multisig. 13:39 < waxwing> i'm not sure if i'm remembering the details right, though. 14:00 -!- Dimlock [~Dimlock@89.47.234.28] has quit [] 14:17 -!- TheoStorm [~TheoStorm@78-22-87-51.access.telenet.be] has joined #bitcoin-wizards 14:20 -!- TheoStorm [~TheoStorm@78-22-87-51.access.telenet.be] has quit [Client Quit] 14:22 -!- Kater [~Kater@84.39.117.57] has joined #bitcoin-wizards 14:22 -!- Kater is now known as Guest49850 14:24 -!- davispuh [~quassel@81.198.237.79] has quit [Quit: http://quassel-irc.org - Chat comfortably. 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