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[tor-project] Anti-censorship meeting notes, 2026-06-25

Hey everyone!

Here are our meeting logs:
https://meetbot.debian.net/tor-meeting/2026/tor-meeting.2026-06-25-16.00.html

And our meeting pad:

Anti-censorship work meeting pad
--------------------------------
Anti-censorship
--------------------------------

Next meeting: Thursday, July 2 16:00 UTC
Facilitator: shelikhoo

^^^(See Facilitator Queue at tail)

Weekly meetings, every Thursday at 16:00 UTC, in #tor-meeting at OFTC
(channel is logged while meetings are in progress)

This week's Facilitator: onyinyang
== Goal of this meeting ==

Weekly check-in about the status of anti-censorship work at Tor.
Coordinate collaboration between people/teams on anti-censorship at the Tor Project and Tor community. 


== Links to Useful documents ==
    * Our anti-censorship roadmap:
        * Roadmap:https://gitlab.torproject.org/groups/tpo/anti-censorship/-/boards 
    * The anti-censorship team's wiki page:
        * https://gitlab.torproject.org/tpo/anti-censorship/team/-/wikis/home 
    * Past meeting notes can be found at:
        * https://lists.torproject.org/pipermail/tor-project/
    * Tickets that need reviews: from projects, we are working on:
        * All needs review tickets:
            * https://gitlab.torproject.org/groups/tpo/anti-censorship/-/merge_requests?scope=all&utf8=%E2%9C%93&state=opened&assignee_id=None 
    * Projects the TPI anti-censorship team is working on:
        * Project 146: Expanding access to digital media through the use of secure communications, infrastructure, tools, and techniques             * https://gitlab.torproject.org/groups/tpo/anti-censorship/-/issues/?label_name%5B%5D=Project%20146         * Project 170: Monitoring and reporting on censorship against the Tor network 
            * epic: https://gitlab.torproject.org/groups/tpo/-/epics/17
        * Project 201: Signaling channels
            * board https://gitlab.torproject.org/groups/tpo/-/boards/2675?label_name[]=Project%20201 

== Announcements ==

    * Tor mid-year break: July 6-10
        * no meeting on July 9

== Discussion ==

    *

== Actions ==

    *

== Interesting links ==


== Reading group ==

    * We will discuss "" on
        *
        * Questions to ask and goals to have:
            * What aspects of the paper are questionable?
            * Are there immediate actions we can take based on this work?
            * Are there long-term actions we can take based on this work?
                *
            * Is there future work that we want to call out in hopes that others will pick it up? 
    * Next in the Reading Group Queue:
        *

== Updates ==
Name:
        This week:
            - What you worked on this week.
        Next week:
            - What you are planning to work on next week.
        Help with:
            - Something you need help with.

cecylia (cohosh): 2026-06-25
    Last week:
        - fixed security issue in Snowflake where malformed webrtc offers and answers could cause crashes in the client, proxy, and broker (snowflake#40546)         - worked on rate limiting feature of proxy fairness proposal (snowflake#40506) 
    Next week:
        - continue to review PT spec implementation in UAT
        - make proxy-bridge reachability checks robust to bridge outages (snowflake#40504) 
        - more work on letting broker inform proxies how often to poll
            - rate limiting
        - follow up about running shadow simulations for snowflake performance 
        - revisit conjure integration with lyrebird
        - take a look at potential snowflake orbot bug
            - https://github.com/guardianproject/orbot-android/issues/1183


dcf: 2026-06-25
    Last week:
    Next week:
        - look at issues
https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/meek/-/work_items/40007 meek-server session ID file descriptor limit https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/meek/-/merge_requests/2 goptlib upgrade in meek 
    Help with:

meskio: 2026-06-25
    Last week:
        - telegram distributing bridges with local addresses (rdsys#306)
        - research security report on rdsys memory exhaustion (rdsys#309)
        - update meek dependencies (meek!2)
    Next week:
        - telegram distributing bridges with local addresses (rdsys#306)


Shelikhoo: 2026-06-18
    Last Week:
         - [Testing] Unreliable+unordered WebRTC data channel transport for Snowflake rev2 (cont.)( https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake/-/merge_requests/315 ) testing environment setup/research 
            - Merge request Reviews
            - [Research] proxy pool overload and potential blocking in Iran ( https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake/-/issues/40077#note_3361718 )             - [Research] Add three NAT type buckets to the snowflake broker ( https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake/-/issues/40077#note_3361718 )             - Add Socks5 Based Interactive Connectivity Test for snowflake (https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake/-/merge_requests/699) (Done)             - [Research] Request for Comment: Rust Library for TLS Fingerprint Imitation with Delegation Route Usage in Tor Browser) https://gitlab.torproject.org/tpo/applications/tor-browser/-/work_items/45056#note_3426867 
    Next (working) Week/TODO:
        - Merge request reviews
        - [Deployment]Unreliable+unordered WebRTC data channel transport for Snowflake rev2 (cont.)( https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake/-/merge_requests/315 ) Building custom Tor Browser with patch applied 
        - Vantage point maintaince
            - [Research] proxy pool overload and potential blocking in Iran ( https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake/-/issues/40077#note_3361718 )             - [Research] Add three NAT type buckets to the snowflake broker ( https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake/-/issues/40077#note_3361718 ) 
            - Add 3 type nat bucket to snowflake broker
            - [Research] Request for Comment: Rust Library for TLS Fingerprint Imitation with Delegation Route Usage in Tor Browser) https://gitlab.torproject.org/tpo/applications/tor-browser/-/work_items/45056 
            (cont.)

onyinyang: 2026-06-25
    Last week(s):
            - Work for project #170 to detect bridge blocking
    Next week:
           - Continue tasks for project #170

   Switch back to some of these:
       As time allows:
          - Continue work on rdsys#196
                - Continue Investigating rdsys#248 i.e., why dysfunctional webtunnel bridges are being distributed 
                - Troubleshooting conjure not connecting in China
                        - waiting for more information from conjure authors/maintainers                 - Lox still seems to be filling up the disk on the rdsys-test server despite changes made to delete old entries, look into what's going wrong                Blog post for conjure: https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/conjure/-/issues/46               - review Tor browser Lox integration https://gitlab.torproject.org/tpo/applications/tor-browser/-/merge_requests/1300 
              - add TTL cache to lox MR for duplicate responses:
https://gitlab.torproject.org/tpo/anti-censorship/lox/-/merge_requests/305

            - Work on outstanding milestone issues:
                - key rotation automation

        Later:
        pending decision on abandoning lox wasm in favour of some kind of FFI? https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/43096): 
            - add pref to handle timing for pubkey checks in Tor browser
            - add trusted invitation logic to tor browser integration:
https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/42974
        - improve metrics collection/think about how to show Lox is working/valuable 
        - sketch out Lox blog post/usage notes for forum

    (long term things were discussed at the meeting!):
        - brainstorming grouping strategies for Lox buckets (of bridges) and gathering context on how types of bridges are distributed/use in practice             Question: What makes a bridge usable for a given user, and how can we encode that to best ensure we're getting the most appropriate resources to people?                 1. Are there some obvious grouping strategies that we can already consider?                     e.g., by PT, by bandwidth (lower bandwidth bridges sacrificed to open-invitation buckets?), by locale (to be matched with a requesting user's geoip or something?)                 2. Does it make sense to group 3 bridges/bucket, so trusted users have access to 3 bridges (and untrusted users have access to 1)? More? Less? 

theodorsm: 2026-05-28
        Last weeks:
            - Researching possible DTLS block in Russia
                - https://github.com/net4people/bbs/issues/603#issuecomment-4451730751 
            - Implementing DTLS 1.3 in pion
        Next weeks:
            - Implementing DTLS 1.3 in pion
        Help with:
            -



Facilitator Queue:
    onyinyang shelikhoo cohosh meskio
1. First available staff in the Facilitator Queue will be the facilitator for the meeting 2. After facilitating the meeting, the facilitator will be moved to the tail of the queue 

--
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onyinyang

GPG Fingerprint 3CC3 F8CC E9D0 A92F A108 38EF 156A 6435 430C 2036

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