Chaos Computer Club - recent events feed

In our talk, we would like to give conference participants an insight into practical use cases for the Matrix solution. We will cover projects in the healthcare sector, external security, and public administration. We will discuss the approach taken for a Matrix implementation project. We will share insights on how to successfully execute such a complex project, using the TK Messenger and the “Bun...

In a comprehensive digital workspace, the ultimate measure of success for Matrix is invisibility. End-users shouldn't manage a separate Matrix profile, understand what a homeserver is, or manually exchange Matrix IDs. But how do you take a protocol designed to be the center of its own universe and cleanly relegate it to a silent, powerful chat engine under the hood of a broader platform? This talk...

Just days before this conference, the European Commission adopted the **European Technological Sovereignty Package**, placing open source explicitly at the centre of Europe's digital strategy for the first time. The timing is not coincidental. It is the political response to a structural dependency Europe can no longer afford to ignore: critical infrastructure — including healthcare — running on p...

Over five decades, is the largest strategic partner for common, trusted, and cybersecure digital foundations across the entire UN system. Today, UNICC serves over 100 UN entities and other international organizations, operating in a global environment where secure, cross-agency collaboration is essential to fulfilling its mandates. Therefore, UNICC is uniquely positioned to identify and promote th...

Waldur is a multi-tenant cloud and HPC resource-management platform. In Estonia it powers the state cloud (Riigipilv) and the national scientific computing infrastructure (ETAIS), where deployments routinely involve personal and sensitive data. Yet support for all of it happens across scattered channels: Slack, Signal, email, whatever a given user reaches for. The context for any single deployment...

The European Commission defines tech sovereignty as Europe’s ability to act independently in the digital world by developing and controlling key technologies, data, and infrastructure, while reducing reliance on non-EU providers. On June 3, the European Commission has published a tech sovereignty package. What’s included in the package? What’s positive? What the Commission didn’t get quite right a...

The privacy paradox (the theory that people say they care about their privacy but behave as if they do not), assumes that user behaviours are irrational, uninformed, and based on choosing convenience above their own data protection. My research points to a different perspective: people do care, and they also behave inconsistently, but not always out of convenience. At its core, it seems that peopl...

Every organization that adopts Matrix federation makes the protocol more valuable. Every gap they hit makes adoption harder. Rocket. Chat runs Matrix federation in production for government, defence, and critical infrastructure organizations, and that work shows where the protocol already meets customer expectations, and where it can go further. This talk shares our findings from real-world implem...

2026 has seen the resurgence of Next Generation Matrix research funded by Element, as we get back to futureproofing Matrix for the medium-long term. The main project has been the return to P2P Matrix: embedding homeservers inside modern Matrix clients, speaking the very latest Matrix room versions, supporting arbitrary overlay networks. This opens up the world of Matrix for pure mesh communication...

Digital sovereignty is a board-level priority, but ambition often outpaces reality. In this session, Forrester analyst Dario Maisto presents findings from his latest report, drawing a clear line between sovereignty, privacy, and security, and examining the practical challenges organisations face in reducing dependency on dominant tech stacks, from productivity suites to communication. He explores...

Currently user search can only be done locally, which would at best get a list of all users known to the server. This talk aims at explaining the research we did regarding speccing and implementing a spec change proposal for the user federated search (MSC4258). We will also explained the different solutions we thought about and the associated tradeoffs regarding data privacy, performance and compl...

Introducing a new communication tool into an existing organisation or community usually means training users and addressing their common pain points as best as possible. Over the last few years, Element Server Suite (ESS) has empowered administrators to integrate Element in a way that makes sense for their organisations, through tools like Element Admin and recent improvements in the rest of the M...

Enhancing open standards and data ownership within its ecosystem, the European Commission is walking the (sovereign) talk by introducing a new Digital Workplace service powered by Matrix / Element. This talk walks you through the EC's journey from early architecture decisions to deploying a production ready communication service. We will share the practical reality of integrating Matrix into a lar...

The federation protocol is how Matrix homeservers communicate between each other. In private federations this isn't particularly challenging as the network is trusted but in the public federation this isn't true. This talk dives into what protocol improvements are in the works to make the public federation more secure against Byzantine actors, particularly against "backdating": intentional misuse...

Robrix is a "new" FOSS Matrix client written entirely from scratch in Rust, with some cool power user features like a **dockable-tabs view** of multiple rooms side-by-side, just like your favorite IDE. It's simple and flexible enough for casual chatters as well, and can seamlessly transition into a sleek mobile-friendly adaptive UI for narrow screens. Robrix runs smoothly and consistently across m...

Matrix already provides the essential primitives for a decentralized calendar: room memberships, federated state exchange, spaces, and support for custom event and room types. This session explores the technical integration of RFC 8984 (JSCalendar) within the Matrix protocol. We will examine how the JSON-based representation of JSCalendar can be mapped to Matrix state events and what pieces are mi...

NeoBoard, the open-source real-time collaborative whiteboard built on the Matrix protocol, has come a long way since its first appearance at the Matrix Conference. In this talk, Nordeck's CEO gives an honest account of where the product stands today — the architecture, the open-source release, the feature roadmap — and announces some surprises that take NeoBoard beyond the developer community and...

To make the most of the sovereignty and interoperability enabled by Matrix, governments need to deploy at scale; across multiple organisations within their own country, between partner countries and mission partner environments. At an even larger scale, they may also need to support government to citizen communications - literally tens or even hundreds of millions of people. This session explores...

This talk will first present an amazing demo where someone from the Swedish Matrix public sector deployment will magically be able to talk to someone on the French one, and perhaps perhaps we will even be joined by someone from the NATO one, what an amazing time to be alive! A presentation will follow to talk about how we manage to pull this through, being on a technological or human cooperation l...

Modern military operations depend on command and control (C2) systems that can share information quickly and securely across organisational, national and network boundaries. Building and keeping trust across these environments is still one of the hardest problems in defence communications. In this session, Luke Wattan will share Labrys Technologies’ view on how Matrix can help extend trust across...

Element Call already proves what is possible with MatrixRTC: decentralised, federated, end-to-end encrypted video and voice calls powered entirely by the Matrix protocol — but most of the Matrix ecosystem hasn't yet adopted it. To change this we need to build an ecosystem around MatrixRTC that is as vibrant as Matix itself. This talk outlines the vision of components for such an ecosystem and cons...

Sweden's eSam initiative(eSamverkansprogrammet) has explored Matrix as a foundation for interoperable communication across public-sector organizations. Starting with a live federation pilot between two national agencies, the work has evolved into a broader effort involving governance, security, legal frameworks, and long-term sustainability. This session discusses how Matrix can support digital so...

From user discovery and end to end encryption to push notifications: how the requirements for a matrix messenger differs if the target audiance are individuals instead of businesses. Since 2017 I'm developing FluffyChat, first for Ubuntu Touch and since 2020 also for Android, iOS, Web and Linux. Always with one goal in mind: Target individuals instead of businesses and therefore as a non profit pr...

In some environments, governments and regulated organisations can't simply put people in a room and let them talk. What can be shared, and who can read it, is governed by a formal classification policy and by the clearances held by everyone present. This talk walks through a working implementation of security labelling in Matrix using Synapse, Element Web and Advanced Identity & Access Management....

Tools for enabling metadata privacy - which prevents network observers from inferring who communicates with whom - have technically matured over decades. Yet, despite their maturity, these tools remain absent from today's mainstream messaging platforms. This talk looks beyond technical aspects and presents research into adoption barriers focusing on potential users themselves. It presents a study...