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[tor-project] Anti-censorship team meeting notes, 2026-05-07

Hey everyone!

Here are our meeting logs:
https://meetbot.debian.net/tor-meeting/2026/tor-meeting.2026-05-07-16.00.html

And our meeting pad:

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

Next meeting: Thursday, May 07 16:00 UTC
Facilitator: onyinyang

^^^(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:shelikhoo
== 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 201: Signaling channels
            * milestone for may https://gitlab.torproject.org/groups/tpo/-/milestones/83             * board https://gitlab.torproject.org/groups/tpo/-/boards/2675?label_name[]=Project%20201 


== Announcements ==
    *

== Discussion ==

    * Project 201: Status and plan for next week and any blocker?. --gaba
        * Activity 1.1: Review existing implementations, research literature, and internal documentation.             * https://gitlab.torproject.org/tpo/anti-censorship/team/-/work_items/189         * Activity 2.1: Research possible fingerprint diversification system implementations         * Activity 3.4: Implement AMP Cache in Rust. 3.4.1 prototype of ampcache in rust.             * https://gitlab.torproject.org/tpo/anti-censorship/team/-/work_items/190         * Activity 3.6: Implement SQS in Rust. 3.6.1 prototype sqs in rust.             * https://gitlab.torproject.org/tpo/anti-censorship/team/-/work_items/191         * Activity 4.1: Evaluate nine promising signaling channels for use in library             * https://gitlab.torproject.org/tpo/anti-censorship/team/-/work_items/192 
    * UAT licensing
        * https://gitlab.torproject.org/tpo/anti-censorship/team/-/work_items/178#note_3407331         * Preference for MIT license, just checking that it does not affect credit for authorship? 

== Actions ==

    *

== Interesting links ==

    * https://github.com/masterking32/MasterHttpRelayVPN
        * tunnel through https://script.google.com/, currently one of the things used in Iran 

== 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): 2026-05-07
    Last week:
        - deployed broker fix to prevent proxies from reporting negative client counts 
        - started audit of UAT (anti-censorshipteam#178)
        - started documentation of signalling channel use and implementations (anti-censorship/team#189)         - fixed up browser implementation of poll interval timeouts (snowflake-webext!100) 
    Next week:
        - continue signaling channel documentation
        - 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
            - revise and deploy proxy support
        - 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: 2026-05-07
    Last week:
        - made a merge request to report an error binding to the metrics port in the snowflake proxy https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake/-/merge_requests/707 https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake/-/work_items/40520         - reviewed merge request for snowflake proxy self-reported client counts https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake/-/merge_requests/710         - commented on issue about meek-server trusting Meek-IP and X-Forwarded-For HTTP headers https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/meek/-/issues/40006         - reported broken snowflake-stats metrics tarballs for April 2026 https://gitlab.torproject.org/tpo/network-health/metrics/collector-rs/-/issues/48#note_3405223 
    Next week:
    Help with:

meskio: 2026-05-07
    Last week:
        - look at the X-Forwarded-For issue in meek (meek#40006)
        - Evaluate signaling channels for use in library (team#192)
        - project reports
        - grant planning work
    Next week:
        - investigate ideas for signaling channels (team#192)


Shelikhoo: 2026-05-07
    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 ) 
            - WebTunnel Censorship Research
            - Vantage point maintaince
            - Research on Signaling Channel: TLS fingerprint diversification/imitation 
    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 ) 
            - WebTunnel Censorship Research
            - Research on Signaling Channel: TLS fingerprint diversification/imitation 

onyinyang: 2026-05-07
    Last week(s):
            -Continued implementing detection algorithm based on connecting ips in rdsys 
            - Started working on implementing Project 201:
                - AMPCache Library in Rust
    Next week:
            - Sonctinue working on Project 201
                -AMPCache Rustlang Library
                - SQS Rustlang Library
           - Continue tasks for project #170 (Postponed for May)

   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: 2026-04-23
        Last weeks:
            - Report bug in collector-rs for the network health team
            - Researching possible DTLS block in Russia
            - Implementing DTLS 1.3 in pion
        Next weeks:
            - Implementing DTLS 1.3 in pion
        Help with:
            -



Facilitator Queue:
    onyinyang cohosh meskio  shelikhoo
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

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