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114 lines
8.3 KiB
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114 lines
8.3 KiB
Markdown
---
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layout: post
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title: Logs for the Monero Research Lab Meeting Held on 2018-07-30
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summary: Sarang work, others work, and miscellaneous
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tags: [dev diaries, community, crypto, research]
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author: el00ruobuob / sarang
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---
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# Logs
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**\<sarang>** We can start now
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**\<sarang>** Greetings
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**\<sarang>** This will be a brief meeting to catch up on recent research
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**\<sarang>** All bulletproof audits have completed
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**\<sarang>** Kudelski's final report is posted. QuarksLab is updating theirs with our responses before releasing their final version. Benedikt Bunz is updating his similarly with our feedback.
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**\<silur>** yaay
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**\<sarang>** I continue to work on some new ring signature algos from Ruffing et al.
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**\<oneiric\_>** very nice, excited to read the most recent reports
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**\<sarang>** lots of fun building blocks with that scheme
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**\<sarang>** and suraeNoether has provided a multisig paper for me to review
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**\<sarang>** that is also in progress
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**\<sarang>** any questions on these things in particular?
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**\<silur>** let's collaborate on that I have an implemaentation on the first paper version
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**\<silur>** C, openssl
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**\<sarang>** silur: sure, the initial parts of the prototype are on my repo, rupol branch, in python
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**\<silur>** been working on rtrs for a long time
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**\<silur>** okay, will write you after the meeting
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**\<sarang>** anything in particular to share regarding your rtrs silur ?
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**\<silur>** well we just have to update it to the new-new-new construction
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**\<silur>** I only have the unpublished internal version of the first paper
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**\<sarang>** righto
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**\<sarang>** We shall talk afterward
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**\<sarang>** Any other interesting work to be shared?
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**\<endogenic>** anyone see a problem with running openssl transpiled via emscripten in a browser?
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**\<sarang>** I feel extremely not qualified to answer that properly
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**\<andytoshi>** endogenic: openssl, transpiling, emscripten, and browsers are all bad for security
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**\<endogenic>** yep, no worries, just throwing it out there
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**\<sarang>** lol
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**\<endogenic>** then why does monero use it lol
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**\<silur>** where?
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**\<andytoshi>** monero is writtcen in C++
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**\<endogenic>** common/util.cpp (LOL) #include <openssl/sha.h>... ringct/bulletproofs.cc #include <openssl/ssl.h> ...
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**\<silur>** yea but where do we transpile it with emscripten?
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**\<endogenic>** just asking
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**\<silur>** I don't really recommend that
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**\<endogenic>** any specific reason?
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**\<silur>** don't know about emscripten internals but we used to have a thing called openssl code health tuesdays
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**\<silur>** after a month we eliminated 40K dead lines and 8 dead platforms
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**\<silur>** I think that's a reason not to include it in browsers
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**\<endogenic>** emscripten handles that sort of stuff
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**\<andytoshi>** there are lots of reasons that projects might have an openssl dep (bitcoin had one for a while). it takes time to eliminate it as other options are developed
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**\<silur>** also it has lots of inline ASM stuff how does emscripten handle that?
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**\<andytoshi>** but in all seriousness, if you're doing crypto in a browser, you should stop, because it's snake oil. a browser cannot run code in a secure environment.
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**\<needmoney90>** Did anyone check out the paper I posted last week?
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**\<needmoney90>** https://arxiv.org/abs/1702.07588
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**\<andytoshi>** http://matasano.com/articles/javascript-cryptography/
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**\<endogenic>** andytoshi: people are going to run worse web wallets if we don't
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**\<endogenic>** run one that is
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**\<needmoney90>** I'm curious if FHE can be used for remote node syncing, to allow us to make queries on encrypted data
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**\<endogenic>** silur: 1sec
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**\<andytoshi>** needmoney90: you want PIR for that, not FHE. and there are existing PIR primitives that are actually implemented and usable (see percy++)
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**\<needmoney90>** It's possible that due to our static append only data set that we can't actually hide access patterns
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**\<silur>** needmoney90 thanks a lot, it seems super interesting
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**\<needmoney90>** Never heard of PIR, got a paper for me?
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**\<needmoney90>** Maybe I just don't know the acronym
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**\<sarang>** private information retrieval
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**\<silur>** lots of stuff on PIR
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**\<silur>** thanks for percy++, i'm working with pir a lot for riffle
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**\<silur>** where do we need that btw?
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**\<silur>** in monero?
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**\<endogenic>** silur: emscripten might not be able to handle it, depending on exactly what's there. i guess maybe an alternative implementation exists
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**\<endogenic>** people seem to have been able to do it , in any case
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**\<endogenic>** 🤞
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**\<oneiric\_>** is boringssl an option for you?
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**\<endogenic>** oh
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**\<endogenic>** ./configure --no-asm
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**\<endogenic>** of course
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**\<endogenic>** oneiric\_: not to ignore you - i'll investigate if it becomes necessary
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**\<sarang>** Anyone else wish to share something intriguing on their minds?
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**\<sarang>** Also welcome andytoshi
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**\<isthmuscrypto>** Oh, I can give a #noncense-research-lab summary
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**\<sarang>** please
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**\<isthmuscrypto>** Lots of action in the Monero Archival Project this week. @n3ptune released a new version of our custom archival daemon, and @serhack has been working wonders, configuring and maintaining our network of global VPS-based nodes.
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**\<isthmuscrypto>** I have been playing around with temporal analysis of the blockchain. Miner-reported timestamps were shown to be very unreliable, since 2% of blocks include a timestamp that is \*before\* the timestamp of the block prior.
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**\<isthmuscrypto>** These time-traveling Merlin blocks showed up while scoping out the distribution of wait times. https://usercontent.irccloud-cdn.com/file/tLUEZ9aU/ttblocks.png // Looking at the wait times for the block above and below the Merlin blocks themselves, we see that it is skewed toward a longer interval afterward, suggesting that they are actually being retroactively timestamped.
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**\<isthmuscrypto>** Our new daemon (upgraded last night) records the node-receipt timestamp(s) in addition to the miner-reported timestamp, so expect some way more detailed analysis of that soon.
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**\<isthmuscrypto>** I'm a little exploratory study of how fast the blockchain syncs at each height. It's mostly a cute novelty, but if there are interesting features (e.g. discontinuities around introduction of new tech), or notable conclusions about empirical scaling, I'll share back here.
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**\<isthmuscrypto>** (/end)
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**\<isthmuscrypto>** Whoops, here's the second link, showing the skew in wait times before and after Merlin blocks: https://usercontent.irccloud-cdn.com/file/f46p6Ddd/merlin\_parent\_child
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**\<sarang>** this is very interesting work
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**\<andytoshi>** sarang: we've made a lot of progress on musig recently; you can see https://github.com/apoelstra/secp256k1/blob/2018-04-taproot/src/modules/musig/musig.md for our current API. may have insights valuable to monero in future when you guys support arbitrary multisigs
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**\<sarang>** oh excellent, thanks
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**\<isthmuscrypto>** Shoot, I gave the wrong channel above. #noncesense-research-lab
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**\<sarang>** andytoshi: what are the overall plans for musig?
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**\<andytoshi>** sarang: well, musig signatures verify identically to schnorr..
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**\<andytoshi>** so the goal is for bitcoin to support schnorr as part of taproot
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**\<andytoshi>** and then wallets would implement musig if they're doing multisig stuff
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**\<andytoshi>** since the resulting multisigs would be smaller/more private than ones using CHECKMULTISIG
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**\<sarang>** Great, so laying the groundwork for future wallet code
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**\<sarang>** cool
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**\<sarang>** It seems fairly quiet here otherwise today, so any other material to share?
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**\<andytoshi>** not really, i've mostly been doing rust-bitcoin ecosystem work
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**\<endogenic>** yknow people have been transpiling rust to JS too :P
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**\<silur>** and wasm :D
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**\<endogenic>** well that's what i mean :P
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**\<silur>** wasm openssl is not a bad idea tho
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**\<silur>** looks like I have a new sideproject
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**\<endogenic>** oh that's just what i'm talking about...
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**\<endogenic>** whoever beats the other to it i guess
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**\<endogenic>** it's easy enough
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**\<endogenic>** i have instructions.. :P
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**\<endogenic>** i have boost transpiled already..
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**\<sarang>** Well, I think we can safely call the meeting then, everyone can continue performing admirably
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