2.0 -//Pentabarf//Schedule//EN PUBLISH CL3HJB@@cfp.2025.matrix.org -CL3HJB Opening en en 20251016T100000 20251016T101000 001000

Opening

PUBLIC CONFIRMED Short Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/CL3HJB/ Ada Byron Yan Minagawa PUBLISH 3RXLTQ@@cfp.2025.matrix.org -3RXLTQ The Matrix.org Foundation Updates en en 20251016T101000 20251016T103500 002500

The Matrix.org Foundation Updates

PUBLIC CONFIRMED Short Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/3RXLTQ/ Ada Byron Amandine Le Pape PUBLISH 8PEMJB@@cfp.2025.matrix.org -8PEMJB The Matrix State of the Union en en 20251016T103500 20251016T110000 002500

The Matrix State of the Union

PUBLIC CONFIRMED Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/8PEMJB/ Ada Byron Matthew Hodgson PUBLISH KCKEYJ@@cfp.2025.matrix.org -KCKEYJ How the new Swiss Open Source Law EMOTA strengthens Digital Sovereignty en en 20251016T112000 20251016T114500 002500

How the new Swiss Open Source Law EMOTA strengthens Digital Sovereignty

PUBLIC CONFIRMED Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/KCKEYJ/ Ada Byron Matthias Stürmer PUBLISH DZBGLP@@cfp.2025.matrix.org -DZBGLP Sweden's Public Sector in Transition: Exploring Open Standards for Interoperable Communication en en 20251016T115000 20251016T121500 002500

Sweden's Public Sector in Transition: Exploring Open Standards for Interoperable Communication

PUBLIC CONFIRMED Short Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/DZBGLP/ Ada Byron Kenneth Edwall Anna Engström PUBLISH PUUXDL@@cfp.2025.matrix.org -PUUXDL Texting Through the Silence: Medical Care over Matrix with Delay during a Simulated Moonwalk en en 20251016T123000 20251016T125500 002500

Texting Through the Silence: Medical Care over Matrix with Delay during a Simulated Moonwalk

We start with a quick introduction of the LUNA Analog Facility, why a Moon-like regolith hall, ground segment, and “moonwalk” simulation are ideal for testing communications under stress, then walk through our method: we intentionally disabled voice, enforced ~20-second one-way delay, and coordinated clinical care entirely over Matrix/Element on a delay-tolerant (store-and-forward) link. You’ll see how we compared open free-text with a compact, structured chat grammar and which small conventions, clear end-markers, role tags, micro-acks, bounded message size, simple priority cues, reliably reduced ping-pong and cognitive load while keeping treatment safe. From there, we look beyond the Moon: practical takeaways for Earth hospitals facing outages (offline-first clients, lightweight message grammar for critical steps, prebuilt templates), and EVA-oriented tweaks that seem promising, such as lightweight clinical field sets and mobile/edge Matrix homeservers with opportunistic federation under delay. Publications are in progress; this session focuses on the method and early signals and what they imply for building resilient, message-driven care when “real-time” isn’t guaranteed. PUBLIC CONFIRMED Short Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/PUUXDL/ Ada Byron Jan-Lukas Furmanek Aileen Rabsahl PUBLISH L8LXQU@@cfp.2025.matrix.org -L8LXQU Consolidating Germany’s administrative communication: Towards a joint Matrix-based architecture en en 20251016T141000 20251016T150000 005000

Consolidating Germany’s administrative communication: Towards a joint Matrix-based architecture

Note: If you want something more hands-on, take a deep dive into our technical pilot project for Matrix-based G2C-communication in Germany by attending our second talk at this year's Matrix conference: https://cfp.2025.matrix.org/matrix-conf-2025/talk/Q3LKTY/ PUBLIC CONFIRMED Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/L8LXQU/ Ada Byron Dominik Braun PUBLISH MDHBPY@@cfp.2025.matrix.org -MDHBPY Trialing Matrix within the European Commission for resilient and sovereign communications en en 20251016T151000 20251016T153500 002500

Trialing Matrix within the European Commission for resilient and sovereign communications

PUBLIC CONFIRMED Short Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/MDHBPY/ Ada Byron Nicolas Dubois PUBLISH 9HKYHA@@cfp.2025.matrix.org -9HKYHA The German BundesMessenger en en 20251016T161000 20251016T170000 005000

The German BundesMessenger

PUBLIC CONFIRMED Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/9HKYHA/ Ada Byron Kai A. Hiller PUBLISH Q3LKTY@@cfp.2025.matrix.org -Q3LKTY An Update on reaching the German Government via Matrix en en 20251016T171000 20251016T180000 005000

An Update on reaching the German Government via Matrix

Visit our projet page for more details https://gitlab.opencode.de/fitko/matrix-g2x (currently in German) This project is part of a larger target architecture, see the earlier talk "Consolidating Germany’s administrative communication: Towards a joint Matrix-based architecture" by my colleague Dominik Braun. PUBLIC CONFIRMED Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/Q3LKTY/ Ada Byron networkException PUBLISH XTTQ3R@@cfp.2025.matrix.org -XTTQ3R From Healthcare to Governments: Building Europe’s Secure Messaging Standard en en 20251016T112000 20251016T114500 002500

From Healthcare to Governments: Building Europe’s Secure Messaging Standard

PUBLIC CONFIRMED Short Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/XTTQ3R/ Alan Turing Phillipp Kurtz PUBLISH YMCDE7@@cfp.2025.matrix.org -YMCDE7 The TI-Messenger Story en en 20251016T115000 20251016T121500 002500

The TI-Messenger Story

PUBLIC CONFIRMED Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/YMCDE7/ Alan Turing Michael Thiele PUBLISH QGQX9L@@cfp.2025.matrix.org -QGQX9L Matrix’s Role in the German Healthcare System: The TI-Messenger as a Communication Infrastructure for Healthcare en en 20251016T123000 20251016T125500 002500

Matrix’s Role in the German Healthcare System: The TI-Messenger as a Communication Infrastructure for Healthcare

PUBLIC CONFIRMED Short Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/QGQX9L/ Alan Turing Marie Ruddeck PUBLISH GDWSJR@@cfp.2025.matrix.org -GDWSJR Matrix as a Bridge – Enabling Cross-Border Healthcare Communication Through Open Standards en en 20251016T141000 20251016T150000 005000

Matrix as a Bridge – Enabling Cross-Border Healthcare Communication Through Open Standards

PUBLIC CONFIRMED Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/GDWSJR/ Alan Turing Patrice Zoe Brend'amour PUBLISH BBXTLT@@cfp.2025.matrix.org -BBXTLT Famedly – Secure Communication in Health Care with Matrix en en 20251016T151000 20251016T153500 002500

Famedly – Secure Communication in Health Care with Matrix

PUBLIC CONFIRMED Short Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/BBXTLT/ Alan Turing Krille (Christian K.) PUBLISH SHDUM3@@cfp.2025.matrix.org -SHDUM3 Nationwide Rollout of Matrix-Based Instant Messaging (TI-M) for 74 Million Statutorily Insured Citizens in German Healthcare en en 20251016T154000 20251016T160500 002500

Nationwide Rollout of Matrix-Based Instant Messaging (TI-M) for 74 Million Statutorily Insured Citizens in German Healthcare

PUBLIC CONFIRMED Short Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/SHDUM3/ Alan Turing Jan Kohnert PUBLISH AETNRS@@cfp.2025.matrix.org -AETNRS Large-scale multi-tenancy hosting for TI-Messenger en en 20251016T161000 20251016T163500 002500

Large-scale multi-tenancy hosting for TI-Messenger

PUBLIC CONFIRMED Short Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/AETNRS/ Alan Turing Patrick Maier PUBLISH AVAL3A@@cfp.2025.matrix.org -AVAL3A E2EE Direct Messaging in Bluesky with Matrix en en 20251016T171000 20251016T173500 002500

E2EE Direct Messaging in Bluesky with Matrix

By reusing Matrix for E2EE DMs in Bluesky, we not only offer a trusted and tested open source encryption stack but also allow users to later expand their usage beyond chat to other Matrix features such as E2EE voice, video and more. Alternate approaches to build E2EE from scratch in Bluesky will take many years to achieve feature parity with Matrix. Moreover the federated Matrix architecture can allow Bluesky users a BYOMA (Bring Your Own Matrix Account) option, that stands as a unique advantage, not available from any other social media. Matrix enthusiasts should be excited, as the adoption of this approach for E2EE DMs in Bluesky can significantly expand the Matrix user base, and draw in many more users to experience the richness of the Matrix ecosystem. PUBLIC CONFIRMED Short Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/AVAL3A/ Alan Turing Ranga Krishnan PUBLISH BAKSEA@@cfp.2025.matrix.org -BAKSEA Beyond Olm: About challenges and opportunities in Messaging Layer Security (MLS) en en 20251016T112000 20251016T121000 005000

Beyond Olm: About challenges and opportunities in Messaging Layer Security (MLS)

> Messaging Layer Security (RFC 9420, MLS) is a modern layer for end-to-end encrypted group messaging providing Forward Secrecy (PFS) and Post-Compromise Security (PCS). MLS further provides performance that’s logarithmic in the group size, an easy migration to post-quantum security, and is a rigorously analyzed protocol. This talk will discuss the opportunities and challenges offered by MSC4256 proposing a way to integrate MLS into [matrix] rooms. As a guidance, I will focus on the following questions : - Which advantages does MLS feature over Olm ? - Which tradeoffs can we accept with an interoperable encryption standard ? - How can we keep a federated ecosystem working with an encryption standard not meant for complete distribution ? - How can we ensure to keep sync of MLS state and [matrix] room state ? - How can we incrementally migrate an ecosystem to another encryption standard ? The entire topic of MLS is obviously too big for a single talk. Many of the open questions may only be discussed briefly. The aim of this talk is not to present outstanding solutions like a miracle but rather to inform about the current state of the specification, the ecosystem and next steps. PUBLIC CONFIRMED Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/BAKSEA/ Lynn Conway The one with the braid (she/her) PUBLISH Z9B878@@cfp.2025.matrix.org -Z9B878 Matrix and MLS - Water, Oil and Mayonnaise en en 20251016T122000 20251016T131000 005000

Matrix and MLS - Water, Oil and Mayonnaise

PUBLIC CONFIRMED Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/Z9B878/ Lynn Conway Nico PUBLISH KHM9ZY@@cfp.2025.matrix.org -KHM9ZY NeoBoard S: a whiteboard matrix client offering endless possibilities for real-time collaboration en en 20251016T141000 20251016T143500 002500

NeoBoard S: a whiteboard matrix client offering endless possibilities for real-time collaboration

PUBLIC CONFIRMED Short Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/KHM9ZY/ Lynn Conway Robert Gerbauld PUBLISH CYXHGK@@cfp.2025.matrix.org -CYXHGK SIP/Element: Unifying Telephony and Modern Communication en en 20251016T144000 20251016T153000 005000

SIP/Element: Unifying Telephony and Modern Communication

XiVO SIP bridge project presented a significant development challenge, underscoring its disruptive and creative nature. This wasn't a simple assembly of existing technologies, but an engineering effort to bridge two fundamentally different protocols: WebRTC used by Matrix ecosystem and SIP from the IP telephony world. This bridge (built as a Synapse module for now) allows Element to integrate enterprise telephony capabilities provided by XiVO, open source IPBX using Asterisk. The integration approach between XiVO telephony and the Matrix protocol involved designing specific gateways and APIs for interoperability of identities (XiVO user vs. Matrix user, i.e., phone number vs. mxID) and telephony features (answer, hang up, hold, etc.) directly within the Element Web interface. The impacts, and outcomes of this successful bridge project are significant. It allows a substantial reduction in communication costs for businesses by eliminating proprietary telephony licenses, all within a single, open-source unified communication tool. It also creates value for the French and European open-source ecosystems. In short, the XiVO/Element bridge is not a mere improvement on existing solutions but a disruptive proposal that creates a "bridge" between the world of traditional telephony and modern unified communications. It, nevertheless, required solving complex problems: - How do you reconcile different protocols and semantics? The SIP protocol manages specific states and signals (e.g., INVITE for ringing, HOLD for putting a call on hold) that have no direct equivalent in the Matrix protocol. The difficulty lies in designing a mechanism capable of interpreting these SIP events, translating them into relevant Matrix events, and vice versa, to maintain a consistent user experience. - The bridge must be able to robustly track the state of these sessions and ensure that actions performed on one side (for example, rejecting a call in the web interface) are correctly executed and reflected on the XiVO PBX in SIP. A failure in this IPBX/Matrix synchronization could lead to inconsistencies (e.g., a call that still appears active on one side even though it has ended on the other). The idea is to use this presentation to share our progress on this bridge, its integration into our soft-fork of Element (xivo-connect) with a supporting demo, and our expectations to integrate it into Tchap (French gov soft-fork of Element). We also want to share our successes and ideas for the future to benefit the entire Matrix community. PUBLIC CONFIRMED Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/CYXHGK/ Lynn Conway Laurent Meiller PUBLISH BQZHAH@@cfp.2025.matrix.org -BQZHAH Element Call: Redefining conferencing for privacy, scale, and sovereignty en en 20251016T153500 20251016T162500 005000

Element Call: Redefining conferencing for privacy, scale, and sovereignty

Last year, we introduced Element Call as the next-generation MatrixRTC solution for calling over Matrix. In 2025, it’s no longer just a promising beta—it’s the default call experience in Element apps and a key pillar of the Matrix ecosystem. This talk will cover the evolution of Element Call over the past year, including: - MatrixRTC in production: how Element Call is now the core calling experience in Element apps, replacing the legacy call stack. - Scalable E2EE group calls: supporting large encrypted calls with significantly improved reliability and federation support. - New transport layer: leveraging to-device messages for secure and robust end-to-end media encryption across calls. - A new MatrixRTC Transport using a Multi-SFU approach - Ease of use: new UX features like emoji reactions and background blurring. - Mobile-first features: introducing Handset Mode for more natural audio on mobile devices. Whether you're a Matrix developer, community member, or integrator, this session will give you an inside look at where MatrixRTC is headed and how to build on top of it. PUBLIC CONFIRMED Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/BQZHAH/ Lynn Conway Florian Heese Timo Kandra Aaron Thornburgh PUBLISH GX397V@@cfp.2025.matrix.org -GX397V Commercialising Matrix en en 20251016T163000 20251016T172000 005000

Commercialising Matrix

Agenda: 1. Why Meedio? Why Matrix? 2. Going open source - choosing the right business model 3. From proprietary to Matrix - evolution timeline 4. Technical integration journey - architecture overview 4.1 Meedio solutions 4.2 Meedio components infrastructure 4.3 MSC's used 5. KBV-Certified consultations - when Signal is not enough 6. Scaling federation and predictability 6.1 Vanilla Synapse 6.2 Desperation phase 6.3 Vanilla Synapse to ESS Pro 6.4 Synapse Pro (ESS Pro) 7. Demo PUBLIC CONFIRMED Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/GX397V/ Lynn Conway Runi Hammer Arnas Johannes PUBLISH QG8QQU@@cfp.2025.matrix.org -QG8QQU The High Price of Open Source: Building a Business Around Matrix en en 20251016T172500 20251016T181500 005000

The High Price of Open Source: Building a Business Around Matrix

PUBLIC CONFIRMED Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/QG8QQU/ Lynn Conway Benedict Benken Dr. Patrick Alberts PUBLISH WEASKJ@@cfp.2025.matrix.org -WEASKJ The Element update: Shininess, scalability and sustainability en en 20251017T100000 20251017T102500 002500

The Element update: Shininess, scalability and sustainability

PUBLIC CONFIRMED Short Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/WEASKJ/ Ada Byron Neil Johnson PUBLISH XDT3BL@@cfp.2025.matrix.org -XDT3BL Governing Board transparency update en en 20251017T103000 20251017T105500 002500

Governing Board transparency update

PUBLIC CONFIRMED Short Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/XDT3BL/ Ada Byron Kim Brose Nico PUBLISH GEEKMY@@cfp.2025.matrix.org -GEEKMY Luxchat(4gov) en en 20251017T111000 20251017T113500 002500

Luxchat(4gov)

PUBLIC CONFIRMED Short Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/GEEKMY/ Ada Byron Patrick Weber PUBLISH CAUAHD@@cfp.2025.matrix.org -CAUAHD How Matrix is becoming the communication standard for Public Sector en en 20251017T114000 20251017T120500 002500

How Matrix is becoming the communication standard for Public Sector

PUBLIC CONFIRMED Short Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/CAUAHD/ Ada Byron Amandine Le Pape PUBLISH MHZQVK@@cfp.2025.matrix.org -MHZQVK ESS - Element’s distribution for Matrix deployments en en 20251017T121000 20251017T130000 005000

ESS - Element’s distribution for Matrix deployments

PUBLIC CONFIRMED Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/MHZQVK/ Ada Byron Patrick Maier PUBLISH 7SRHXV@@cfp.2025.matrix.org -7SRHXV No Desk Is an Island: Enabling Cross-Border Workspace Communication en en 20251017T140000 20251017T145000 005000

No Desk Is an Island: Enabling Cross-Border Workspace Communication

PUBLIC CONFIRMED Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/7SRHXV/ Ada Byron Alexander Smolianitski PUBLISH WWAVBQ@@cfp.2025.matrix.org -WWAVBQ Matrix French gov deployment: opening a private federation securely en en 20251017T150000 20251017T152500 002500

Matrix French gov deployment: opening a private federation securely

PUBLIC CONFIRMED Short Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/WWAVBQ/ Ada Byron Mathieu Velten PUBLISH WM9WAE@@cfp.2025.matrix.org -WM9WAE Secure and Sovereign communications for United Nations International Computing Centre and its Partners en en 20251017T153000 20251017T155500 002500

Secure and Sovereign communications for United Nations International Computing Centre and its Partners

PUBLIC CONFIRMED Short Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/WM9WAE/ Ada Byron Tima Soni PUBLISH W9LUVA@@cfp.2025.matrix.org -W9LUVA Element X and Pro Updates en en 20251017T160000 20251017T165000 005000

Element X and Pro Updates

PUBLIC CONFIRMED Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/W9LUVA/ Ada Byron Aaron Thornburgh Andreas Doug Earnshaw PUBLISH 7ZXT8V@@cfp.2025.matrix.org -7ZXT8V Supporting TF-X with Matrix: best practices and pitfalls en en 20251017T170000 20251017T175000 005000

Supporting TF-X with Matrix: best practices and pitfalls

PUBLIC CONFIRMED Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/7ZXT8V/ Ada Byron Jeroen Franssen PUBLISH X3KDAQ@@cfp.2025.matrix.org -X3KDAQ Eventually Consistent Access Control: Practical Insights on Matrix from Decentralized Systems Theory en en 20251017T111000 20251017T120000 005000

Eventually Consistent Access Control: Practical Insights on Matrix from Decentralized Systems Theory

In this talk, I provide a primer on **design patterns from decentralized systems theory**, and explain what they mean for the current and future design of Matrix in practice. I will start with **concurrency as the root of all problems in decentralized systems**, and how network partitions and arbitrarily malicious servers stand in the way of consistency. Based on these problems, I will explain **conflict-free replicated data types** (CRDTs) and hash linking as the solution to still make a Matrix room eventually converge at all benevolent servers. Finally, I will show you my **access control to the best of knowledge and belief** way of thinking about eventually consistent access control in Matrix – you need to think in **two authorization decisions per event**, of which one is final on receiving the event, while the other one may ever be changing on receiving new concurrent events. PUBLIC CONFIRMED Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/X3KDAQ/ Alan Turing Florian Jacob Hannes Hartenstein PUBLISH YK9F38@@cfp.2025.matrix.org -YK9F38 Improving the security of the federation protocol en en 20251017T121000 20251017T130000 005000

Improving the security of the federation protocol

The federation protocol, in particular state resolution, is one of the most important parts of Matrix. In the current algorithm, the output from the algorithm can be counter-intuitive, and multiple people have tried to explain how it works (including a talk from me at FOSDEM this year!) with varying degrees of success. This behaviour sometimes rears its ugly head when your room state has rolled back to an earlier point in time for no good reason: a "state reset". Fixing these issues is hard, partly because the current algorithm is so tricky - so over the course of 2025 we’ve been working on improving and (eventually) simplifying it. Along the way, we've developed tooling to help us observe and replay room state in the form of TARDIS: Time Agnostic Room DAG Inspection Service. This tool has been critical for us to produce minimal working examples of state resets and to experiment with algorithmic changes to fix the underlying issues. We'll explore some of these scenarios in TARDIS during the talk. PUBLIC CONFIRMED Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/YK9F38/ Alan Turing Kegan Dougal PUBLISH BT8WR9@@cfp.2025.matrix.org -BT8WR9 Invisible Crypto: can Matrix be both secure and easy to use? en en 20251017T140000 20251017T145000 005000

Invisible Crypto: can Matrix be both secure and easy to use?

We've been working on the Invisible Crypto initiative for over a year, and arguably things have got worse rather than better: some parts of Matrix crypto are more visible than they were before. We will go into some detail about what we've done so far and why those things temporarily make more noise, but will eventually lead to a peaceful, hassle-free experience of encrypted messaging. Most of the coding has been done in matrix-rust-sdk and the Element clients, but the intention is for these efforts to serve as examples for other implementations. Key goals of the initiative are to ignore "insecure" devices, and treat user identities as trust-on-first-use by default. To make these possible, we have worked on a lot of things that actually make crypto more visible: - Shields for messages from insecure devices - Encouraging device verification - Building a shared language to talk about crypto - Noticing and warning about devices with incomplete crypto information - Warnings about messages whose sender identity is unsure - Letting the user know when an identity changes and we plan to continue with things that mostly make crypto less visible, while also becoming more secure: - Excluding insecure devices - Authenticated backup - Sharing identity updates between devices - Fixing bugs that allow a device's crypto information to be incomplete - Showing identity changes in timelines instead of pop-ups - "Dehydrated" devices so messages received while logged out can be decrypted - Recovery key management Improving crypto-related code is always painstaking, but we hope to convince you that we are making steady progress, and demonstrate how you can help! PUBLIC CONFIRMED Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/BT8WR9/ Alan Turing Andy Balaam PUBLISH VLF9QQ@@cfp.2025.matrix.org -VLF9QQ Joining the conversation: balancing privacy with usability for encrypted messages en en 20251017T150000 20251017T155000 005000

Joining the conversation: balancing privacy with usability for encrypted messages

The Element Crypto team have been working on [MSC4268](https://github.com/matrix-org/matrix-spec-proposals/pull/4268), aka "Sharing room keys for past messages". We'll talk about why this is difficult from the cryptographic perspective, and discuss the architecture behind the implementation. PUBLIC CONFIRMED Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/VLF9QQ/ Alan Turing Richard van der Hoff PUBLISH 7LNZZ3@@cfp.2025.matrix.org -7LNZZ3 Why do I have 2 passwords? How to talk about encryption in Matrix en en 20251017T160000 20251017T165000 005000

Why do I have 2 passwords? How to talk about encryption in Matrix

End-to-end encryption (E2EE) is unfamiliar to people used to using modern applications: instead of handing over total trust to the server you connect to, E2EE makes the server a simple connector, and we only have to trust the people we are actually talking to. It is quite common for people using Matrix to ask "Why do I have 2 passwords?", referring to the username and password for logging in, and the recovery key. I recently made a leap of understanding about this question: the reason is that there are two audiences: the password is for your homeserver, and the recovery key is for allowing you to talk to other people. I began working on MSC4161 ("Crypto terminology for non-technical users") because I believed we needed to standardise our vocabulary, but it quickly became clear that we need to do more than that: if we want to make Matrix easy to use, we need to agree on: - what the main ideas are, - what words we use to describe them, and - what metaphors we use to explain. In its current form, the MSC focusses on the first two. In this talk, I will summarise the ideas and words that are reasonably settled in the MSC and will hopefully make their way into the spec, and I will also introduce some ideas I have about the third item: how to explain Matrix's E2EE using some metaphors that are intended to find the right level of explanation, and be more accurate than the metaphors we have used up to now. We will go through the proposed common words: - Devices/sessions and Identity - Verified users - Message keys, message history and key storage - Recovery and recovery keys Then we will look at some proposed metaphors: - "connect" for logging in, - "id card" for identity, and - "safe deposit box" for recovery I will try to argue that these metaphors are at the right level of explanation, and they match more closely to what is really happening than the ideas we have used up to now. PUBLIC CONFIRMED Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/7LNZZ3/ Alan Turing Andy Balaam PUBLISH CJSBUZ@@cfp.2025.matrix.org -CJSBUZ The Role of the Matrix Protocol within Germany’s Sovereign and Secure Health Messenger Solution – A Loyal Player Embracing the Evolution of Secure Architectures en en 20251017T170000 20251017T172500 002500

The Role of the Matrix Protocol within Germany’s Sovereign and Secure Health Messenger Solution – A Loyal Player Embracing the Evolution of Secure Architectures

PUBLIC CONFIRMED Short Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/CJSBUZ/ Alan Turing Univ.Prof. Dipl.-Ing. Dr. Thomas Grechenig PUBLISH SJFXGH@@cfp.2025.matrix.org -SJFXGH Element X Web en en 20251017T111000 20251017T120000 005000

Element X Web

The talk will cover: * The qualities/goals we are aiming for in EWX * The high level plan to achieve this including: * Our product and design strategy * The phased plan for delivery * The key technologies that will enable the transformation * An update on progress and next steps PUBLIC CONFIRMED Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/SJFXGH/ Lynn Conway Danielle Kirkwood David Langley Gaëlle Hunt PUBLISH XLV7PZ@@cfp.2025.matrix.org -XLV7PZ Lessons learned from implementing Native OIDC from scratch en en 20251017T123500 20251017T130000 002500

Lessons learned from implementing Native OIDC from scratch

PUBLIC CONFIRMED Short Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/XLV7PZ/ Lynn Conway The one with the braid (she/her) PUBLISH J7YNGR@@cfp.2025.matrix.org -J7YNGR Rocket.Chat: Entering the Matrix en en 20251017T140000 20251017T145000 005000

Rocket.Chat: Entering the Matrix

PUBLIC CONFIRMED Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/J7YNGR/ Lynn Conway Gabriel Engel PUBLISH UQVVRV@@cfp.2025.matrix.org -UQVVRV MatrixRTC - Introducing a new concept to the Matrix-specification en en 20251017T150000 20251017T155000 005000

MatrixRTC - Introducing a new concept to the Matrix-specification

In this talk, we'll explore the evolving landscape of MatrixRTC, the real-time communication layer of the Matrix protocol, and highlight key advancements. This year we saw a lot of advancements for MatrixRTC. To make it thorugh the spec review process we gathered feedback and added a couple of our own topics that we really wanted to improve. The changes might seem very small but have a very big impact in how good it fits into the matrix eco system. To name one of the highlights: A matrixRTC session can now be dirstirbuted over multiple SFU servers! On top of that a new matrix primitive will be introduced that greatly helps MatrixRTC and is useful in other parts of the ecosystem. With the spec proposals being as polished as never before and the first reviews from SCT members, there is no better time to accelerate the adoption of MatrixRTC-based calls. With Element Call, we went the extra mile to make this adoption as easy as possible. Element Call, being a widget, is available to the broader ecosystem and can be used as a shortcut to make clients compatible with MatrixRTC calls without much development effort. We would like to show how easy it is to implement Element Call into any JS-SDK or Rust SDK backed client (any client supporting the widget API). At the end of the talk, we will have a live demonstration of a call with a client that did not previously support MatrixRTC-based VoIP. PUBLIC CONFIRMED Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/UQVVRV/ Lynn Conway Timo Kandra PUBLISH QCYBMC@@cfp.2025.matrix.org -QCYBMC MatrixRTC - The key sharing problem en en 20251017T160000 20251017T162500 002500

MatrixRTC - The key sharing problem

Why are large encrypted group calls difficult to host? Specifically, we will go into the details about key sharing, how we can use some tricks to optimize it and how they are also a very big footgun. We will also see how other providers like jitsi, zoom, discord and cloudflare handle this. And then show off the new Famedly Call project! There will also be some mentions of MLS and how it fixes this problem and some caveats, therefore attending one of the MLS talks from before is recommended :D PUBLIC CONFIRMED Short Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/QCYBMC/ Lynn Conway Jayesh Nirve (td) PUBLISH BCLRR3@@cfp.2025.matrix.org -BCLRR3 The Matrix SDK No One Talks About en en 20251017T163000 20251017T172000 005000

The Matrix SDK No One Talks About

PUBLIC CONFIRMED Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/BCLRR3/ Lynn Conway Benedict Benken PUBLISH QTBJP3@@cfp.2025.matrix.org -QTBJP3 Schulchat RLP as [matrix]-based school messenger en en 20251018T100000 20251018T102500 002500

Schulchat RLP as [matrix]-based school messenger

For Schulchat RLP we have added a sophisticated address book into the messenger with role based communication templates and adapted the client application, based on FluffyChat, to meet pedagogical requirements, such as enabling active read confirmations. We will be presenting the project lifecycle, challenges with E2EE, SSO, hosting and how we manage user feedback and daily operations. fairkom is a silver member of the [matrix] foundation and offers custom messaging solutions and scalable hosting. PUBLIC CONFIRMED Short Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/QTBJP3/ Ada Byron Lisa Kostrzewa Jan Krammer (Janonym) Philipp Monz Dr. Roland Alton PUBLISH MLHCY7@@cfp.2025.matrix.org -MLHCY7 Building Matrix-Powered Campus Communication Platform Thousands Students en en 20251018T103500 20251018T110000 002500

Building Matrix-Powered Campus Communication Platform Thousands Students

Universities face growing challenges in balancing seamless communication, data privacy and platform sovereignty. This talk presents the story of how I built a Matrix-powered communication platform based on Element for a university community with thousands students, faculty and staff. I will share my hands-on experience deploying a self-hosted Matrix homeserver, using the Element client for academic use and integrating the system with some infrastructure. You'll learn about: - The decision-making process: Why Matrix and Element? - Technical architecture and deployment at scale. - Real-world challenges in onboarding, federation, moderation and support. - Custom feature additions and user adoption results. - Lessons learned and recommendations for other institutions or organizations considering Matrix. This session is ideal for technologists, sysadmins, public sector decision-makers and open-source advocates exploring decentralized alternatives to Slack, Teams or WhatsApp in education or large organizations. So yep, feel free to ask! PUBLIC CONFIRMED Short Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/MLHCY7/ Ada Byron Vladislav Kalinin PUBLISH PTAPZE@@cfp.2025.matrix.org -PTAPZE Portable identites (MSC 2787) and the GDPR right to rectification, a pressing need for server operators en en 20251018T111000 20251018T120000 005000

Portable identites (MSC 2787) and the GDPR right to rectification, a pressing need for server operators

PUBLIC CONFIRMED Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/PTAPZE/ Ada Byron Michael S. PUBLISH PEJYHG@@cfp.2025.matrix.org -PEJYHG A Contextual Integrity approach to privacy in interoperable messaging en en 20251018T121000 20251018T123500 002500

A Contextual Integrity approach to privacy in interoperable messaging

PUBLIC CONFIRMED Short Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/PEJYHG/ Ada Byron Carla Griggio PUBLISH DDKP3V@@cfp.2025.matrix.org -DDKP3V How do messaging app users feel about untraceability? en en 20251018T134000 20251018T140500 002500

How do messaging app users feel about untraceability?

PUBLIC CONFIRMED Short Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/DDKP3V/ Ada Byron Carla Griggio PUBLISH AS8JHQ@@cfp.2025.matrix.org -AS8JHQ Leading the way into CRA compliance: Element’s approach to the incoming regulation en en 20251018T151500 20251018T155000 003500

Leading the way into CRA compliance: Element’s approach to the incoming regulation

PUBLIC CONFIRMED Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/AS8JHQ/ Ada Byron Denise Almeida Amandine Le Pape PUBLISH D83FKE@@cfp.2025.matrix.org -D83FKE Holding the Fort: How did bridges happen en en 20251018T155500 20251018T164500 005000

Holding the Fort: How did bridges happen

This talk features a journey back through time as we look at bridges and integrations that have been built on Matrix over the years, and what we can hope to learn from it. There will be laughter, there will be eyebrows raised, there will be content involving the infamous IRC bridges and there may be a tear or two. There is plenty to dig into here as we go behind the scenes on what it takes to maintain a bridge for the global Matrix community, as well as how the standards of appservices have evolved over the years PUBLIC CONFIRMED Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/D83FKE/ Ada Byron Half-Shot PUBLISH KAB39N@@cfp.2025.matrix.org -KAB39N Closing en en 20251018T170000 20251018T172500 002500

Closing

PUBLIC CONFIRMED Short Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/KAB39N/ Ada Byron Yan Minagawa PUBLISH 3YMJFP@@cfp.2025.matrix.org -3YMJFP Solving the Fork Dilemma: How We Built a Maintainable Matrix Messenger en en 20251018T103500 20251018T112500 005000

Solving the Fork Dilemma: How We Built a Maintainable Matrix Messenger

PUBLIC CONFIRMED Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/3YMJFP/ Alan Turing Benedict Benken Michael Thiele PUBLISH A9YW3B@@cfp.2025.matrix.org -A9YW3B Integrating Matrix in a trustworthy collaborative ecosystem en en 20251018T113500 20251018T120000 002500

Integrating Matrix in a trustworthy collaborative ecosystem

PUBLIC CONFIRMED Short Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/A9YW3B/ Alan Turing Francois HERBRETEAU Anthony PUBLISH TM3ASG@@cfp.2025.matrix.org -TM3ASG Scaling Real-Time in NeoBoard: Our Journey from P2P to MatrixRTC + LiveKit en en 20251018T121000 20251018T123500 002500

Scaling Real-Time in NeoBoard: Our Journey from P2P to MatrixRTC + LiveKit

NeoBoard’s use of the Matrix protocol provides a replicated data store for CRDT-based events exchanged between all users collaborating in a whiteboard session. These custom events encapsulate shape and drawing data and are shared via the room timeline, enabling clients to reconstruct a consistent, persistent view of the board over time, even across network disconnections or when joining later. However, while this model ensures eventual consistency, it falls short for real-time interactions that require low-latency feedback, such as live cursor movement or simultaneous drawing. For these use cases, a dedicated real-time transport layer is essential. Using WebRTC, we initially added a real-time layer to NeoBoard that enabled low-latency peer-to-peer communication between users. However, this relied on a full-mesh topology, where each client maintains direct data channels with every other participant. This architecture quickly becomes unsustainable as the number of users grows, due to quadratic bandwidth and connection overhead. Additionally, WebRTC depends on ICE negotiation using STUN and TURN servers to establish connectivity across NATs and firewalls, which is often unreliable and can introduce additional latency and server load. The resulting variability in connection quality and resource usage made it difficult to deliver a consistent experience at scale. Given the success of Element Call's adoption of MatrixRTC and LiveKit, we decided to move forward with an alternative real-time data layer based on these technologies that, given enough backend resources, can scale indefinitely. In this talk, we’ll cover: - The architecture and design of NeoBoard’s real-time layer - An overview of relevant MatrixRTC spec proposals and their role in our migration - Implementing MatrixRTC with a LiveKit backend, including: - Session membership management - RTC focus handling - Infrastructure considerations and requirements - Live demo - Key challenges and what’s next PUBLIC CONFIRMED Short Talk https://cfp.2025.matrix.org/matrix-conf-2025/talk/TM3ASG/ Alan Turing Milton Moura PUBLISH 8N8HZS@@cfp.2025.matrix.org -8N8HZS Getting started with Element Server Suite Community en en 20251018T133500 20251018T150500 013000

Getting started with Element Server Suite Community

This workshop introduces you to the Element Server Suite (ESS), a streamlined and user-friendly way to deploy a Kubernetes-based Matrix 2.0-ready stack. No prior Kubernetes experience is required ! The suite is designed to be simple and accessible for both beginners and experienced users. During the session, you’ll walk through a hands-on deployment using one of three options: - your own Kubernetes cluster - a virtual machine with a single-node k3s cluster - or your laptop running KinD (Kubernetes in Docker). You’ll gain insight into the architecture of the suite, learn how to set up a self-hosted Matrix server, and explore how ESS can be customized to meet the needs of your community. By the end, you'll have a working Matrix 2.0 environment with a Synapse homeserver, Matrix Authentication Service, RTC backend, and Element web client - all ready to use! PUBLIC CONFIRMED Workshop https://cfp.2025.matrix.org/matrix-conf-2025/talk/8N8HZS/ Alan Turing Gaël Goinvic PUBLISH ZJLB3Q@@cfp.2025.matrix.org -ZJLB3Q Tune Your Chat en en 20251018T151500 20251018T164500 013000

Tune Your Chat

What Tools, Addons, Hacks or Code snippets do you use daily to enhance your Matrix experience? I show you my 8 years worth of collecting scripts, Maubot configs, and stranger things - not to mention my own projects - and look forward to learning what you are doing as well! Please remember to bring your devices etc so you can show off your creations! This is the 7th time I'll be offering this continuously improved workshop. PUBLIC CONFIRMED Workshop https://cfp.2025.matrix.org/matrix-conf-2025/talk/ZJLB3Q/ Alan Turing Kim Brose