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PODCAST

Chaos Computer Club - recent audio-only feed

Der Chaos Computer Club ist die größte europäische Hackervereinigung, und seit über 25 Jahren Vermittler im Spannungsfeld technischer und sozialer Entwicklungen.

technology

All Episodes

00:32:27

What Networks tell us about Trades, Power, and the...

Chaos Computer Club - recent audio-only feed ·

2025/10/17

Networks are all around us, shaping phenomena like epidemics, communication, and transportation. In this talk, we will explore how real-world problems can be analyzed and solved using graph-based methods and simple algorithms. Drawing from examples such as trade networks, corporate structures, and historical data, I will demonstrate how network analysis reveals insights that would otherwise remain hidden. Using NetworKit (and NetworkX), we will analyze real-world datasets to answer questions like:

00:33:53

Gompertz Linear Units (GoLU) (sps25)

Chaos Computer Club - recent audio-only feed ·

2025/10/17

Activation functions are fundamental elements of deep learning architectures as they significantly influence training dynamics. ReLU, while widely used, is prone to the dying neuron problem, which has been mitigated by variants such as LeakyReLU, PReLU, and ELU that better handle negative neuron outputs. Recently, self-gated activations like GELU and Swish have emerged as state-of-the-art alternatives, leveraging their smoothness to ensure stable gradient flow and prevent neuron inactivity. In this

00:25:46

The Role of the Matrix Protocol within Germany’s...

Chaos Computer Club - recent audio-only feed ·

2025/10/17

Germany’s digital health infrastructure has long been built on the principles of sovereignty, open standards, and interoperability. With the electronic patient record (ePA) and KIM for secure data and document exchange, Germany established a federated ecosystem using standards such as FHIR and OIDC with sectoral identity providers. The recent introduction of the TI-Messenger (TIM) extends this ecosystem to real-time communication — now connecting over 25 million insured citizens through the RISE

00:38:22

Supporting TF-X with Matrix: best practices and...

Chaos Computer Club - recent audio-only feed ·

2025/10/17

NATO organised a TaskForce-X Baltics event where we very quickly contracted, deployed and integrated telemetry and video streams from uncrewed platforms. This required a lot of coordination and this was done through our on-prem Matrix capability. I would like to share my experience by using Matrix to support this very demanding operational project. Licensed to the public under https://creativecommons.org/licenses/by-sa/4.0/ about this event:

00:26:13

The Matrix SDK No One Talks About (matrix-conf-2025)

Chaos Computer Club - recent audio-only feed ·

2025/10/17

Trixnity is rapidly emerging as a powerful, flexible, and fully asynchronous SDK for building Matrix applications using Kotlin Multiplatform. What many don't realize: Trixnity is already in widespread use - potentially powering apps usable by over 50 million people. It’s embedded in multiple Matrix-based messengers, though you’d only know it by digging into app license disclosures. This talk shines a light on Trixnity’s hidden but significant role in the Matrix ecosystem and why more developers

00:31:17

Anonymization of sensitive information in financial...

Chaos Computer Club - recent audio-only feed ·

2025/10/17

Data is the fossil fuel of the machine learning world, essential for developing high quality models but in limited supply. Yet institutions handling sensitive documents — such as financial, medical, or legal records often cannot fully leverage their own data due to stringent privacy, compliance, and security requirements, making training high quality models difficult. A promising solution is to replace the personally identifiable information (PII) with realistic synthetic stand-ins, whilst leaving

00:50:15

Why do I have 2 passwords? How to talk about...

Chaos Computer Club - recent audio-only feed ·

2025/10/17

Most modern software applications give total trust to the service provider. End-to-end encrypted (E2EE) services are different: the service provider is a gateway, and the real trust is with other people. This is unfamiliar, and can make using E2EE confusing. When you add in federation (meaning lots of different service providers) and a diverse set of client apps, trying to make Matrix's encryption understandable is tricky. It would help to have a shared set of words and definitions. In this talk I

00:41:17

Element X and Pro Updates (matrix-conf-2025)

Chaos Computer Club - recent audio-only feed ·

2025/10/17

We will provide you with the latest updates on Element X mobile apps, as well the plan to sunset our classic Element apps. This includes both the current state, as well as a look into what to expect during the next couple of months and details about specific features like threads and spaces that many people are looking forward to on Element X. In the second part we’ll cover the intent and purpose behind the Element Pro apps - who are these for and why, and as part of it, look into how we’re allowing

00:17:48

MatrixRTC - The key sharing problem (matrix-conf-2025)

Chaos Computer Club - recent audio-only feed ·

2025/10/17

Why is having large encrypted group calls difficult? How do other providers solve this? The future? Demos! 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

00:14:53

Secure and Sovereign communications for United...

Chaos Computer Club - recent audio-only feed ·

2025/10/17

Secure communication leveraging the Matrix protocol for UNICC and its partners Licensed to the public under https://creativecommons.org/licenses/by-sa/4.0/ about this event: https://cfp.2025.matrix.org/matrix-conf-2025/talk/WM9WAE/

00:25:46

Agentic Cyber Defense with External Threat...

Chaos Computer Club - recent audio-only feed ·

2025/10/17

This talk will detail how to integrate external threat intelligence data into an autonomous agentic AI system for proactive cybersecurity. Using real world datasets—including open-source threat feeds, security logs, or OSINT—you will learn how to build a data ingestion pipeline, train models with Python, and deploy agents that autonomously detect and mitigate cyber threats. This case study will provide practical insights into data preprocessing, feature engineering, and the challenges of adversarial

00:53:32

MatrixRTC (matrix-conf-2025)

Chaos Computer Club - recent audio-only feed ·

2025/10/17

In this talk, we will share the newest improvements to MatrixRTC. We'll focus on how the security and encryption architecture has evolved to provide robust, private communications for Matrix users. Additionally, we will show how to integrate Element Call into clients using the Rust or JS-SDK in a matter of minutes. Whether you're building a custom Matrix client or want to know what makes MatrixRTC such a great solution for secure communication, you'll walk away with practical knowledge to bring

00:22:05

Matrix French gov deployment: opening a private...

Chaos Computer Club - recent audio-only feed ·

2025/10/17

The French government has deployed a private Matrix federation for French civil servants called Tchap. Currently this federation has about 300 000 monthly active users and its usage is growing constantly. Today our federation is closed and we would like to be able to connect with other public French Matrix nodes (local authorities for instance), and also other European countries. We should implement measures to ensure that the federation remains resilient against potential attacks, both technical

00:50:29

Joining the conversation: balancing privacy with...

Chaos Computer Club - recent audio-only feed ·

2025/10/17

Being able to read the conversation in a room before you joined is a critical feature for some usecases, but end-to-end encryption makes it tricky to implement. In this technically-focussed talk, we'll cover the challenges behind implementing "history sharing", why previous attempts in this area failed, and how we solved those problems with minimal impact on the security or efficiency of the protocol. The Element Crypto team have been working on

00:51:49

Rocket.Chat: Entering the Matrix (matrix-conf-2025)

Chaos Computer Club - recent audio-only feed ·

2025/10/17

In this talk, we trace the journey of evolving Rocket.Chat from a standalone collaboration server into a full-fledged Matrix home-server — all built in TypeScript. We’ll dive into the architecture decisions, the incremental features (federation, room state sync, identity translation, event routing, crypto, and bridging), and the real challenges of combining two paradigms (Rocket.Chat’s internal model + the Matrix spec) in one codebase. You’ll hear about lessons learned: when to build vs reuse, how

00:39:38

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

Chaos Computer Club - recent audio-only feed ·

2025/10/17

As EU member states (co-)develop sovereign workspace solutions for the public sector, the need for seamless communication between these platforms becomes increasingly important. France, Germany, and the Netherlands are among the countries working on such solutions together, with the goal of facilitating cross-border collaboration and data exchange while maintaining security and sovereignty. In collaboration with our French and Dutch partners, we at ZenDiS are developing a framework to enable

00:51:15

Invisible Crypto: can Matrix be both secure and easy...

Chaos Computer Club - recent audio-only feed ·

2025/10/17

The Invisible Crypto initiative intends to make Matrix easier to use by ensuring that encrypted messaging is secure by default, and the user is not bothered by irrelevant information. In this talk we will give a status update, hopefully explaining why crypto needed to become slightly more visible on the journey towards making it disappear. We'll go into some detail about what we've done (and why some of it makes things a little more noisy) and what we plan to do to really get there. We've been

00:33:08

Docling: Get your documents ready for generative AI...

Chaos Computer Club - recent audio-only feed ·

2025/10/17

Docling is an open-source Python package that simplifies document processing by parsing diverse formats — including advanced PDF understanding — and integrating seamlessly with the generative AI ecosystem. It supports a wide range of input types such as PDFs, DOCX, XLSX, HTML, and images, offering rich parsing capabilities including reading order, table structure, code, and formulas. Docling provides a unified and expressive DoclingDocument format, enabling easy export to Markdown, HTML, and

00:33:15

Causal ML for Smarter Advertising Campaigns with...

Chaos Computer Club - recent audio-only feed ·

2025/10/17

Traditionally, marketing campaign analysis relies on simple metrics like the number of purchases made after a contact, or conversions following a promotion. While these numbers tell us what happened, they don’t reveal why it happened or if the campaign truly made a difference. Such analysis can’t distinguish between customers who would have acted anyway and those who were genuinely influenced by the campaign. The key question is: did the campaign actually cause the desired effect? In this practical

00:27:04

Lessons learned from implementing Native OIDC from...

Chaos Computer Club - recent audio-only feed ·

2025/10/17

Are we OIDC yet ? YES ! We are ! OpenID Connect evolved as the one and only identity standard in the modern web. With MSC3861, the [matrix] ecosystem is finally moving to OIDC as the authentication standard amongst clients and homeservers. Out of curiosity, I started implementing a native OIDC implementation from scratch : no OAuth 2.0 library, no Ruma ; just the [matrix] Dart SDK, an HTTP client and the MSC in front of me. This talk will be about the lessons learned. Licensed to the public under

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