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I Hated All The Cross-Stitch Software So I Made My Own: My Deranged Outsider Software Suite For Making Deranged Outsider Art (39c3)
I wanted to design beautiful header diagrams and ASCII tables suitable for stitching on throw pillows, but found existing tools for cross-stitch design to be all wrong. I made my own set of command-line tools for building this chunky, pixelated visual art. If you've never seen a cross-stitch sampler that had bitrot, this talk will fix it. Designing cross-stitch patterns, I got frustrated with all the programs which expected me to click around a canvas setting individual pixels. I wanted a cross-stitch design software suite that I could drive with a Makefile, which could give...
Closing Ceremony (39c3)
Power off! Nach vier wunderbaren Tagen kommt der Congress nun langsam zum Ende. Lasst uns zurückblicken, die Eindrücke sortieren und diese inspirierte Stimmung nach draußen tragen.
Licensed to the public under http://creativecommons.org/licenses/by/4.0
about this event: https://events.ccc.de/congress/2025/hub/event/detail/closing-ceremony
Video:39c3-1253-eng-Closing_Ceremony.mp4
Battling Obsolescence – Keeping an 80s laser tag system alive (39c3)
Keeping old projects working can be an uphill battle. This talk explores how the laser tag system Q-Zar (Quasar in the UK) has been kept alive since the company behind it failed in the 90s. The challenges encountered, the lessons learnt, and how those can be applied to our own future projects to maximise the project lifetime. Looking at the effects of obsolescence in the context of a laser tag system from the 1980s Q-Zar (Quasar in the UK), what needed to happen to keep it going to enable people to continue...
CCC&T - Cosmic ray, the Climate Catastrophe and Trains. (39c3)
How can we predict soil moisture by measuring cosmic ray products and what have trains to do with it? Ever wondered how this Dürremonitor works, that you heared about in ther german news? These question and some more I will try to answer while I give an overview of some of the research that is done by the Helmholtz Centre for Environmental Research (UFZ). The Dürremonitor is a programme that is often mentioned in the German news when some regions experience drought. Alongside the Dürremonitor and the underlying Mesoscale Hydrological Model (MHM), there is ongoing...
Who runs the www? WSIS+20 and the future of Internet governance (39c3)
Abbreviations such as WSIS+20, IGF, IETF, DIEM, ICANN, PDP, ITU or W3C regularly appear in discussions about the Internet, yet often remain vague. This talk provides an update on the current state of Internet governance and explains why decisions made in United Nations processes have direct implications for technical standards, digital infrastructure, and power asymmetries. The starting point is the UN’s WSIS+20 review process, which negotiated the future of the Internet Governance Forum and the roles of stakeholders within it. Against this backdrop, the talk traces the origins of the so-called multistakeholder approach and examines...
Fossile Industrie liebt KI! (39c3)
Der Hype um generative KI und die Gasindustrie bilden in Zeiten der Klimakrise eine bedrohliche Allianz für die Zukunft des Planeten. Obwohl die negativen Klimaauswirkungen generativer KI immer deutlicher werden, sollen in ganz Europa Großrechenzentren gebaut werden und Deutschland „KI-Nation“ werden, was ungeahnte „Wirtschaftskräfte freisetzen soll“ – zumindest, wenn es nach der Bundesregierung geht. Der Ausbau der Recheninfrastruktur für generative KI benötigt viel Energie, Wasser und Ressourcen, was global zu Umweltschäden führt. Prognosen für die EU zeigen, dass der Energieverbrauch in Zukunft so groß werden könnte, dass der Ausbau der erneuerbaren Energien nicht mithalten kann –...
CUII: Wie Konzerne heimlich Webseiten in Deutschland sperren (39c3)
Stellt euch vor, eine private Organisation aus milliardenschweren Konzernen entscheidet, welche Webseiten ihr nicht besuchen dürft - ohne Richter, ohne öffentliche Kontrolle oder Transparenz. Genau das macht die CUII in Deutschland seit Jahren. In Deutschland entscheidet eine private Organisation aus Internetanbietern und großen Unterhaltungskonzernen, welche Webseiten für den Großteil der Bevölkerung nicht mehr erreichbar sind. Die selbsternannte "Clearingstelle Urheberrecht im Internet" sperrt ohne richterliche Beschlüsse den Zugriff auf Hunderte von Domains. Wir haben daraufhin cuiiliste.de ins Leben gerufen, um die geheim gehaltene Liste von Domains zu veröffentlichen und so mehr Transparenz in die heimliche Zensur...
Breaking BOTS: Cheating at Blue Team CTFs with AI Speed-Runs (39c3)
After we announced our results, CTFs like Splunk's Boss of the SOC (BOTS) started prohibiting AI agents. For science & profit, we keep doing it anyways. In BOTS, the AIs solve most of it in under 10 minutes instead of taking the full day. Our recipe was surprisingly simple: Teach AI agents to self-plan their investigation steps, adapt their plans to new information, work with the SIEM DB, and reason about log dumps. No exotic models, no massive lab budgets - just publicly available LLMs mixed with a bit of science and perseverance. We'll...
We, the EU, and 1064 Danes decided to look into YouTube: A story about how the EU gave us a law, 1064 Danes gave us their YouTube histories, and reality gave us a headache (39c3)
We explore what happens when Europe’s ambitious data access laws meet the messy realities of studying major digital platforms. Using YouTube as a central case, we show how the European Union’s efforts to promote transparency through the GDPR, the Digital Services Act (DSA), and the Digital Markets Act (DMA) are reshaping the possibilities and limits of independent platform research. At the heart of the discussion is a paradox: while these laws promise unprecedented access to the data that shape our digital lives, the information researchers and citizens actually receive is often incomplete, inconsistent, and difficult...
Infrastructure Review (39c3)
Infrastructure teams present what they did for this years congress and why they did it that way.
39c3 is a big challenge to run, install power, network connectivity and other services in a short time and tear down everything even faster. This is a behind the scenes of the event infrastructure, what worked well and what might not have worked as expected.
Licensed to the public under http://creativecommons.org/licenses/by/4.0
about this event: https://events.ccc.de/congress/2025/hub/event/detail/infrastructure-review
Video:39c3-1806-eng-Infrastructure_Review.mp4