Chaos Computer Club - recent events feed

Jahrelang war die staatliche Intransparenz in Österreich nur eine Punchline in den Congress-Talks von Frag Den Staat. Damit könnte jetzt Schluss sein: seit heuer haben Bürger:innen endlich ein Recht, Dokumente einzusehen und ein Informationsfreiheitsgesetz. Wir zeigen, was Deutschland aus der über ein Jahrzehnt andauernden Kampagne für die Abschaffung des Amtsgeheimnisses lernen kann, wofür uns die Nachbarländer beneiden werden und wofür sich Bayern besonders schämen sollte. Die Kampagne – wie aus "binnen zwei Wochen" mehr als elf Jahre wurden Die Strategien – die man übernehmen kann Der Vergleich – wie ist Österreichische IFG im Vergleich zum Deutschen, und ist das der richtige Die (besten) Preisträger – aus mehr als zehn Jahren des Schmähpreises "Mauer des Schweigens" Die Datenhalde – mit Aufruf, was aus dem Datenberg zu machen Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://events.ccc.de/congress/2025/hub/event/detail/amtsgeheimnis-raus-datenhalde-rein-was-die-informationsfreiheit-in-osterreich-bringt

While FPGA developers usually try to minimize the power consumption of their designs, we approached the problem from the opposite perspective: what is the maximum power consumption that can be achieved or wasted on an FPGA? Short answer: we found that it’s easy to implement oscillators running at 6 GHz that can theoretically dissipate around 20 kW on a large cloud FPGA when driving the signal to all the available resources. It is interesting to note that this power density is not very far away from that of the surface of the sun. However, such power load jump is usually not a problem as it will trigger some protection circuitry. This led us to the next question: would a localized hotspot with such power density damage the chip if we remain within the typical power envelope of a cloud FPGA (~100 W)? While we could not “fry” the chip or induce permanent errors (and we tried several variants), we did observe that a few routing wires aged to become up to 70% slower in just a few days of stressing the chip. This basically means that such an FPGA cannot be rented out to cloud users without risking timing violations. In this talk, we will present how we optimized power wasting, how we measured wire latencies with ps accuracy, how we attacked 100 FPGA cloud instances and how we can protect FPGAs against such DOS attacks. FPGA instances are now offered by multiple cloud service providers (including Amazon EC2 F1/F2 instances, Alibaba ECS Instances, and Microsoft Azure NP-Series). The low-level programmability of FPGAs allows implementing new attack vectors including DOS attacks. While some severe attacks (such as short circuits) cannot be easily deployed as users are prevented to load own configuration bitstreams on the cloud FPGAs, it has been demonstrated that it is possible to leak information (like cloud instance scheduling policies or the physical topologies of the FPGA servers) or to mount DoS attacks by excessive power hammering. For instance, basically all cloud FPGAs provide logic cells that can be configured as small shift registers. This allows building toggle-shift-registers with 10K and more flip-flops, which can draw over 1 KW power when clocked at a few hundred MHz. In our work, we created fast ring-oscillators that bypass all design checks applied during bitstream cloud deployment and how we achieved toggle rates of 8 GHz inside an FPGA by using glitch amplification. The latter one was calibrated with the help of a time-to-digital converter (TDC). As a first attack, we used power hammering to crash AWS F1 instances by increasing power consumption to 300 W (three times the allowed power envelope). We used physical unclonable functions (PUFs) to examine the behaviour of the attacked FPGA cloud instances and we found that most remained unavailable for several hours after the attack. As a more subtle attack, we tried to cause permanent damage to FPGAs in our lab by driving fast toggling signals to virtually any available wire (and primitive) into a small region of the chip. With this, we created hotspot designs that draw 130 W in less than 1% of the available logic and routing resources of a datacenter FPGA. Even though the achieved power density was excessive, it was insufficient to induce permanent damages. This is largely due to the area inefficiencies of an FPGA that limit the power density. For instance, FPGAs use large multiplexers to implement the switchable connections and there exists only one active path that is routed through the multiplexers, hence, leaving most of the transistors sitting idle. Similarly, FPGAs provide a large number of configuration memory cells (about 1 Gb on a typical datacenter device) that draw negligible power as these do not switch during operation. All these idle elements force the power drawing circuits to be spread out, hence limiting power density. Anyway, when experimenting with different hotspot variants, we found thermal runaway effects and excessive device aging with up to a 70% increase in delay on some wires. We achieved this aging in just a few days and under normal operational conditions (i.e. by staying within the available power budget and having board cooling running). Such a large increase in latency can be considered to render an FPGA useless as it will usually not be fast enough to host (realistic) user designs. Beyond exploring these attack vectors, we developed countermeasures and design guidelines to prevent such attacks. These include scans of the user designs, use restrictions to resources like IOs and clock trees, as well as runtime monitoring and FPGA health checks. With this, we believe that FPGAs can be operated securely and reliably in a cloud setting. Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://events.ccc.de/congress/2025/hub/event/detail/how-to-render-cloud-fpgas-useless

Why is electronics manufacturing hard? Can it ever be made easy and more accessible? What will it take to relocate industrial production to Europe? We share with you what we learned when we spent more than 1 year setting up our own production line in our office in Hamburg. Turns out a lot of the difficulties are rarely talked about or hidden behind "manufacturing is high CAPEX". Come and learn with us the nitty gritty details of batch reflow ovens, stencil printing at scale, and how OpenPnP is a key enabler in our process. While we are far from done with this work, we hope to see others replicate it and collectively reclaim the ownership of the means of electronics production. Our industry needs a reboot as well, it no longer serves the people. Our work is based on our belief that high-quality high-mix/low volume manufacturing of electronics in Europe is economically viable and accessible to small companies with a lower-than-expected up-front investment. We believe that relocation of industry to Europe depends on small innovative companies, and will not come from slow and bloated industry giants whose products are victims of enshittification and maximum profit extraction. By using open-source hardware and software whenever possible, we are attempting to set up our own production operation in Hamburg and we want to share the solutions and enable others to do the same and collectively reclaim ownership of the means of production. We will cover: - How we acquired and set up production machines, their costs, and our learnings - Quirks of paste printing and reflow soldering at scale (up to 50 batches a day) - Component inventory, tracking, DfM, etc. - How OpenPnP is a key enabler of our prcesses - Our proposed changes to OpenPnP - Our work integrated Siemens Siplace Feeders in OpenPnP Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://events.ccc.de/congress/2025/hub/event/detail/in-house-electronics-manufacturing-from-scratch-how-hard-can-it-be

Die Freak Show und alle Hörerinnen und Hörer machen eine Sendung als Gespräch Im Clubhouse-Style trifft das Freak Show Team auf seine Hörer. Jeder kann mitmachen. Werde zum Freak Show Host für 5 Minuten. Wir diskutieren mit Euch jedes frühere oder künftige Thema und sind uns auch für Hot Takes nicht zu schade. Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://events.ccc.de/congress/2025/hub/event/detail/the-freak-show-clubhouse

How does live techno work? On the dance floor, it's practically impossible to understand what's happening up front. It's also irrelevant there, because it's all about the music and many other things. Live sets have a thousand faces. Everyone has their own workflow, and there are countless approaches to performing electronic music. I don't know all of them, but I will give a deeper insight into the architecture of my setup in this short presentation. I explain my approach to improvising techno in clubs and at festivals. There will be a few technical insights into my „Ableton“ structure. A fixed structure with an unknown outcome. Because at certain points, I rely on random generators to create the desired element of surprise. This keeps me inspired for hours, again and again. I will show and explain why I make music this way. Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://events.ccc.de/congress/2025/hub/event/detail/kenji-tanaka-live-insights-into-my-workflow-struct

The character of drone wars has changed. The large, cumbersome long-range drones have been complemented with small and low-budget drones. Moreover, more and more states are developing, deploying and selling them. Ten years ago at least 50 states were developing them. At the top are USA, Israel, Turkey, China, Iran and Russia. Russia's attack on Ukraine has unleashed a drone war unlike any seen before. In short time the Ukraine has build significant drone production capabilities and announcement that it will increase its own production of quadcopters and kamikaze drones to one million units per year. German defense companies and startups are now promoting a “drone wall on NATO's eastern flank.” Moreover, despite their vulnerability to air defenses, large drones are also being further developed. They are intended to accompany next generation fighter jets in swarms. In this talk, past and current developments are discussed. What are the perspectives now? The character of drone wars has changed. The large, cumbersome long-range drones have been complemented with small and low-budget drones. Moreover, more and more states are developing, deploying and selling them. Ten years ago at least 50 states were developing them. At the top are USA, Israel, Turkey, China, Iran and Russia. Russia's attack on Ukraine has unleashed a drone war unlike any seen before. In short time the Ukraine has build significant drone production capabilities and announcement that it will increase its own production of quadcopters and kamikaze drones to one million units per year. German defense companies and startups are now promoting a “drone wall on NATO's eastern flank.” Moreover, despite their vulnerability to air defenses, large drones are also being further developed. They are intended to accompany next generation fighter jets in swarms. In this talk, past and current developments are discussed. What are the perspectives now? Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://events.ccc.de/congress/2025/hub/event/detail/current-drone-wars

HostileShop is a python-based tool for generating prompt injections and jailbreaks against LLM agents. I created HostileShop to see if I could use LLMs to write a framework that generates prompt injections against LLMs, by having LLMs attack other LLMs. It's LLMs all the way down. HostileShop generated prompt injections for a winning submission in OpenAI's GPT-OSS-20B RedTeam Contest. Since then, I have expanded HostileShop to generate injections for the entire LLM frontier, as well as to mutate jailbreaks to bypass prompt filters, adapt to LLM updates, and to give advice on performing injections against other agent systems. In this talk, I will give you an overview of LLM Agent hacking. I will cover LLM context window formats, LLM agents, agent vulnerability surface, and the prompting and efficiency insights that led to the success of HostileShop. [HostileShop](https://github.com/mikeperry-tor/HostileShop) creates a simulated web shopping environment where an **attacker agent LLM** attempts to manipulate a **target shopping agent LLM** into performing unauthorized actions. Crucially, HostileShop does not use an LLM to judge attack success. Instead, success is determined automatically and immediately by the framework, which reduces costs and enables rapid continual learning by the attacker LLM. HostileShop is best at discovering **prompt injections** that induce LLM Agents to make improper "tool calls". In other words, HostileShop finds the magic spells that make LLM Agents call functions that they have available to them, often with the specific input of your choice. HostileShop is also capable of [enhancement and mutation of "universal" jailbreaks](https://github.com/mikeperry-tor/HostileShop?tab=readme-ov-file#prompts-for-jailbreakers). This allows **cross-LLM adaptation of universal jailbreaks** that are powerful enough to make the target LLM become fully under your control, for arbitrary actions. This also enables public jailbreaks that have been partially blocked to work again, until they are more comprehensively addressed. I created HostileShop as an experiment, but continue to maintain it to let me know if/when LLM agents finally become secure enough for use in privacy preserving systems, without the need to rely on [oppressive](https://runtheprompts.com/resources/chatgpt-info/chatgpt-is-reporting-your-prompts-to-police/) [levels of surveillance](https://www.anthropic.com/news/activating-asl3-protections). Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://events.ccc.de/congress/2025/hub/event/detail/a-quick-stop-at-the-hostileshop

A brief history of typographic misbehavior or intended and unintended uses of variable fonts. Nine years after the introduction of variable fonts, their most exciting uses have little to do with what variable fonts originally were intended for and their original promise of smaller file sizes. The talk looks at how designers turned a pragmatic font format into a field for experimentation — from animated typography and uniwidth button text to pattern fonts and typographic side effects with unintended aesthetics. Using examples from projects such as TypoLabs, Marjoree, Kario (the variable font that’s used as part of the 39C3 visual identity), and Bronco, we’ll explore how variable fonts evolved from efficiency tools into creative systems — and why the most interesting ideas often emerge when technology is used in unintended ways. When the OpenType 1.8 specification introduced variable fonts in 2016, the idea was simple: combine all weights and styles of a font family into one file and save file size and therefore bandwidth. Yet in 2025, variable fonts have become a platform for artistic and technical exploration far beyond their initial goal. This talk follows that transformation from the inside. It starts with a short history of flexible font technologies — Adobe’s Multiple Master and Apple’s TrueType GX formats of the 1990s (I am just mentioning the company names as they were the publishers of these technologies) — and how they failed to become standards. It then shows why variable fonts succeeded: many designers today are more tech savvy and know some basic HTML, CSS and maybe even some JavaScript. And at the same time all major browsers and almost all design apps support variable fonts by now. From there, I present a series of first-hand projects where typography met code: – TypoLabs (2017), whose identity used a custom variable font animating between extremes of weight and width → the variable font family became the (probably forever) unpublished variable font family Denman; – Marjoree (2024), a pair of variable pattern fonts based on hexagonal and pentagonal tilings that explore legibility and repetition; – Kario (2025), a duplex variable font powering the 39C3 identity, with uniwidth weights, optical-size adjustments, and typographic Easter eggs; – and Bronco (2017?), an experiment using the arbitrary-axis model for interpolation to escape the cube-shaped multiple master design space of traditional variable fonts. The talk then moves from history to speculation. Early head-tracking experiments once tried to adjust a variable font’s optical size based on reader position — producing total chaos as text reshaped itself while being read. On the other hand this playful chaos marks the moment when things become truly interesting: connecting a font axis to live data, to mouse movement, to sound, to network input — anything that makes type responsive and alive. That’s the kind of misbehavior I want to talk about — not breaking for the sake of breaking, but using technology the “wrong” way to see what happens. The talk will mix images, a lot of short videos, and a bit of behind-the-scenes insight into font development. It’s about what happens when design tools meet code, and how that intersection keeps typography alive and unpredictable. Link list of variable font experiments: https://www.bronco.varfont.com/ https://www.denman.varfont.com/ https://www.seraphs.varfont.com/ https://marjoree.showmefonts.com/ + 39C3 visual identity Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://events.ccc.de/congress/2025/hub/event/detail/variable-fonts-it-was-never-about-file-size

Der Vortrag diskutiert Herausforderungen dezentraler Netzwerke aus soziologischer Perspektive. Als dezentrale Netzwerke werden technische Infrastrukturen verstanden, die nicht von einer zentralen Autorität, sondern verteilt über Instanzen zur Verfügung gestellt werden. Nutzer:innen profitieren von dieser Infrastruktur, nutzen beispielsweise das Fediverse oder das Tor-Netzwerk, ohne zur Infrastruktur beizutragen. Zugleich können dezentrale Netzwerke nur dann bestehen, wenn hinreichende Ressourcen von Personen oder Organisationen mobilisiert werden, um das Netzwerk überhaupt zur Verfügung zu stellen. Dies führt zur originären Instabilität dezentraler Netzwerke, wenn nicht der Weg der Kommodifizierung des Nutzer:innenverhaltens eingeschlagen wird. Aufbauend auf dieser Zustandsbeschreibung, werden Bedingungen erörtert, um Kollektivgüter wie dezentrale Netzwerke organisatorisch (und nicht technisch) herzustellen. Hierzu zählen Partizipation oder die Idee einer öffentlichen Grundfinanzierung. Der Vortrag wird neben soziologischen Ideen und harten Zahlen auch durch eine ordentliche Portion Idealismus zu Fragen der Souveränität und Autonomität in der Digitalisierung motiviert. Die Soziologie hat immer etwas mitzuteilen, sobald Fragen kollektiven Handelns auftreten. Dies gilt sowohl für soziale wie auch digitale Räume. So hat der Soziologe Peter Kollock bereits in den 1990er Jahren festgestellt, „the Internet is filled with junk and jerks“ (Kollock, 1999, S. 220). Gegenwärtig dürfte die Mehrheit dieser Aussage anstandslos zustimmen. Aber dies ist nicht der entscheidende Punkt, sondern die weitere Beobachtung: „Given that online interaction is relatively anonymous, that there is no central authority, and that it is difficult or impossible to impose monetary or physical sanctions on someone, it is striking that the Internet is not literally a war of all against all” (1999, S. 220). Die Welt kennt inzwischen zahlreiche Gegenbeispiele, bei denen Autoritäten das Internet nutzen, um das Nutzungsverhalten zu monetarisieren oder Überwachungstechnologien zur Sanktionierung einsetzen (Zuboff, 2019). Diese Ausgangslage beziehe ich in meiner Forschung ein, wenn ich dezentrale Netzwerke wie das Fediverse oder das Tor-Netzwerk aus soziologischer Perspektive betrachte. In erster Linie bin ich daran interessiert zu verstehen, wie dezentrale Netzwerke – organisatorisch nicht technisch – entstehen und welche Herausforderungen es dabei zu überwinden gilt (Sanders & Van Dijck, 2025). Eine zentrale Motivation orientiert sich an der Frage, wie ein Internet ohne zentrale Autorität, verringert von Marktabhängigkeiten, resilient gegenüber Sanktionsmechanismen und Souverän bezüglich eigener Daten, aufgebaut werden kann. Motiviert durch diesen präskriptiven Rahmen, betrachte ich im Vortrag die Herausforderungen zunächst deskriptiv und beziehe meine soziologische Perspektive ein. Denn in der Regel profitieren Menschen, die einen Vorteil aus der Realisierung eines bestimmten Ziels ziehen, unabhängig davon, ob sie persönlich einen Anteil der Kooperation tragen – oder eben nicht. Das kollektive Handeln fällt mitunter schwer, obwohl oder gerade, weil ein begründetes kollektives Interesse zur Umsetzung eines bestimmten Zieles besteht. Gleiche Interessen sind nicht gleichbedeutend mit gemeinsamen Interessen. Diese Situationsbeschreibung ist vielfältig anwendbar von WG-Aufräumplänen bis zu Fragen der klimaneutralen Transformation. Der Grund ist, dass kollektives Handeln ein Mindestmaß an Zeit, Aufwand oder Geld verursacht, sodass vielfach ein Trittbrettfahren gewählt wird in der Hoffnung, dass immer noch genug andere kooperieren, um das gewünschte Ziel zu erreichen (Hardin, 1982). Aus dieser Perspektive betrachte ich dezentrale Netzwerke. So kann das Fediverse oder der Tor-Browser genutzt werden, ohne eine eigene Instanz oder Knoten zu hosten. Dies ist auch nicht das Ziel der genannten dezentralen Netzwerke. Dennoch: Die Kosten und der Aufwand für die technische Infrastruktur müssen von einem kleinen Teil getragen werden, während die überwältigende Mehrheit der Nutzer:innen von der Infrastruktur profitieren, ohne einen Beitrag zu dieser zu leisten. Dies führt zur originären Instabilität dezentraler Netzwerke und stellt eine relevante Herausforderung für die Zukunft dar. Während durch Netzwerkanalysen das Wachstum und die Verstetigung von dezentralen Netzwerken beschrieben wird, fehlt es an einem vertieften Verständnis über Bedingungen wie dezentrale Netzwerke überhaupt entstehen. Während des Vortrags werde ich empirische Daten zur Entwicklung des Fediverse und des Tor-Netzwerkes zeigen, um die Herausforderung zu verdeutlichen. Insbesondere das Tor-Netzwerk steht dabei vor dem Problem, dass die Möglichkeit zur De-Anonymisierung steigt, wenn die Anzahl an Knoten sinkt. Die Überwindung des von mir dargestellten Kollektivgutproblems nimmt demnach eine zentrale Rolle zur Aufrechterhaltung ein. Die Motivation sich mit dezentralen Netzwerken auseinander

Das war nicht das Jahr 2025, das wir bestellt hatten. 2025 war ein gutes Jahr für Exploits, kein gutes Jahr für die Freiheit und ein herausragendes für schlechte Ideen. Regierungen kämpften weiter für Massenüberwachung, natürlich mit KI-Unterstützung™. Kriege wurden weiter „digitalisiert“, Chatkontrolle als Kinderschutz verkauft, Waffensysteme haben inzwischen mehr Autonomie als die meisten Bürger*innen und künstliche Intelligenz löst endlich alle Probleme – vor allem die, die bisher niemand hatte. Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://events.ccc.de/congress/2025/hub/event/detail/ccc-jahresruckblick

The talk will be about our experience from building an open-architecture secure element from the ground up. It explains why openness became part of the security model, how it reshaped design and development workflows, and where reality pushed back — through legal constraints, third-party IP, or export controls. It walks through the secure boot chain, attestation model, firmware update flow, integration APIs, and the testing framework built for external inspection. Real examples of security evaluations by independent researchers are presented, showing what was learned from their findings and how those exchanges raised the overall security bar. The goal is to provoke discussion on how open collaboration can make hardware more verifiable, adaptable, auditable and while keeping secure. This talk shares our engineering experience from designing and implementing an open-architecture secure element — a type of chip that is traditionally closed and opaque. We’ll outline the practical consequences of choosing openness as part of the security model: how it affected hardware architecture, firmware design, verification, and development workflows. The session dives into concrete technical areas including the secure boot chain, attestation and update flow, key storage isolation, and the testing and fuzzing infrastructure used to validate the design. It also covers the boundaries of openness — where third-party IP, export control, or certification requirements force certain blocks to remain closed — and how we document and mitigate those limits. We’ll present anonymized examples of external security evaluations, show how responsible disclosure and transparent fixes improved resilience, and reflect on what “community-driven security” means in a hardware context. Attendees should leave with a clearer view of what it takes to make security verifiable at the silicon level — and why that process is never finished. Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://events.ccc.de/congress/2025/hub/event/detail/lessons-from-building-an-open-architecture-secure-element

What does knitting have to do with espionage? Can embroidery help your mental health? This talk shows how the skills to create textile art have enabled people to resist and to persist under oppressive regimes for centuries. And it offers ways to keep doing so. Working with textile mediums like yarn, thread, and floss is generally seen as a feminine hobby and as thus is usually classified as craft, not art. And crafting is something people, maybe even people usually seen as a bit boring, do in their free time to unwind. Most of us have grown up with the image of the loving grandmother knitting socks for the family, an act of care that was never considered anything special. The patriarchal society’s tendency to underestimate anything considered feminine and, inextricably connected to this, domestic is an ongoing struggle. But being underestimated also provides a cover and with it the opportunity for subversion and resistance. As global powers are cycling back to despotism and opression, let me take you back in time to show you how people used textile crafts to organise resistance and shape movements. Like the quilts that were designed and sewn to help enslaved people in the US escape slavery and navigate the Underground Railroad from the 1780s on, or the knitted garments that carried information about the Nazis to help resistance in occupied Europe during World War II, or the cross stitches by a prisoner of war that had Nazis unknowingly display art saying “Fuck Hitler”. Textile crafts have been used by marginalised and disenfranchised people to protest, to organise, and to persist for centuries. This tradition found a new rise in what is now called “craftivism” and is using the internet to build bigger communities spanning the world. These communities also come together to help, often quite tangibly by creating specific items like the home-sewn masks during early Covid19. In addition, crafting has scientifically-proven benefits for one’s mental health. Taking up the increasingly popular quote "When the world is too scary, too loud, too much: Stop consuming, start creating", this talk shows how the skills to create have enabled and will enable people to resist and to persist. Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://events.ccc.de/congress/2025/hub/event/detail/persist-resist-stitch

Wir, das sind Steffen und arl , besprechen in unserem Podcast alles was die Große und Kleine Fliegerei angeht. Das CFWU Team besteht I.d.R. aus aktiven Piloten:innen von großen und kleinen Flugzeugen, sehr gut unterstützt durch den sehr erfahrenen Flugzeugtechniker Harry! Update GPS Spoofing ATPL (AirlineTransportPilotLicense) Wie lernt man heute fliegen Wie läuft es bei arl seinem ATPL Flugvorbereitungen Was muss man alles machen Technik AirIndia Beispiel für Schwurbelungen Aufbau der Technik Wie schaltet man ein Triebwerk ein Wie schaltet man ein Triebwerk aus Wie schaltet man es im Notfall aus Feuerlöschsystem Das NOTAM System Was ist es Wann wurde es gebaut Wie hat es sich entwickelt Trotz des vermeintlich ernsten Themas sind wir immer mit Humor dabei! Wenn ihr Fragen zur Sendung oder zum Thema habt, stellt sie gerne – am besten schon vorab. Ihr könnt uns kurz vorher antreffen! Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://events.ccc.de/congress/2025/hub/event/detail/comeflywithus

Wir geben Einblicke in zwei intensive Wochen Planung, Koordination und Aufbau, den Betrieb einer (improvisierten) Bodenstation, sprechen über technische Hürden, Antennendesign und Organisation – und wie wir schließlich mit Astronautin Rabea Rogge im Weltraum gefunkt haben. Schon kurz nachdem die ersten Satelliten den Weltraum eroberten, waren auch Amateurfunkende dabei und brachten ihr Hobby in dieses Feld ein. Auch bei Fram2, der ersten bemannten Mission, die beide Polarregionen überflog, war der Sprechfunkkontakt mit einer Universität fest eingeplant. Der studentische Funkclub "AFuTUB" (https://dk0tu.de) an der TU Berlin hat die Crew der Fram2 angefunkt – mit einem experimentellen Funksetup, das für viele von uns Neuland war. Wir geben Einblicke in zwei intensive Wochen Planung, Koordination und Aufbau, den Betrieb einer (improvisierten) Bodenstation, sprechen über technische Hürden, Antennendesign und Organisation – und wie wir schließlich mit der Astronautin Rabea Rogge im Weltraum gefunkt haben. Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://events.ccc.de/congress/2025/hub/event/detail/amateurfunk-im-all-kontakt-mit-fram2

Es gab den Wunsch nach Creator AmA Sessions. Ich würde hiermit eine anbieten. Ich bin aber definitiv remote. ^^ Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://events.ccc.de/congress/2025/hub/event/detail/aaa-ask-advi-anything

This talk presents Apple's link-layer protocol Low-Latency WiFi and how it achieves its real-time capabilities to enable Continuity features like Sidecar Display and Continuity Camera. We make more kernel logging available on iOS and build a log aggregator that combines and aligns system- and network-level log sources from iOS and macOS. Apple's Continuity features make up a big part of their walled garden. From AirDrop and Handoff to AirPlay, they all connect macOS and iOS devices wirelessly. In recent years, security researchers have opened up several of these features showing that the Apple ecosystem is technically compatible with third-party devices. In this talk, we present the internal workings of Low-Latency WiFi (LLW) – Apple's link-layer protocol for several real-time Continuity features like Continuity Camera and Sidecar Display. We talk about the concepts behind LLW, how it achieves its low-latency requirement and how we got there in the reverse engineering process. We also present the tooling we built to enable more kernel-level tracing and logging on iOS through a reimplementation of cctool from macOS and the source code of trace that was buried deep inside of Apple’s open-source repository system_cmds. We build a log aggregator that combines various kernel- and user-space traces, log messages and pcap files from both iOS and macOS into a single file and finally investigate the network stack on Apple platforms that is implemented in both user- and kernel space. There we find interesting configuration values of LLW that make it the go-to link-layer protocol for Apple's proprietary real-time Continuity applications. Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://events.ccc.de/congress/2025/hub/event/detail/cracking-open-what-makes-apple-s-low-latency-wifi-so-fast

**Over the past few decades, nucleic acids have increasingly been investigated as alternative data storage media and platforms for molecular computing. This talk builds on past research and introduces another branch to the field: DNA cryptography based on random chemistry. This technology provides a platform for conceiving new security architectures that bridge the physical with the digital world.** Nucleic acids have been theorized as potential data storage and computation platforms since the mid-20th century. In the meantime, notable advances have been made in implementing such systems, combining academic research with industry efforts. After providing a general introduction to the interdisciplinary field of DNA information technology, in the second half of the talk focuses on DNA-based cryptography and security systems, in particular zooming in on the example of chemical unclonable functions (CUFs) based on randomly generated, synthetic DNA sequences. Similar to Physical Unclonable Functions (PUFs), these DNA-based systems contain vast random elements that cannot be reconstructed – neither algorithmically nor synthetically. Using biochemical processing, we can operate these systems in a fashion comparable to cryptographic hash functions, enabling new authentication protocols. Aside from covering the basics, we delve into the advantages, as well as the drawbacks, of DNA as a medium. Finally, we explore how CUFs could in the future be implemented as physical security architectures: For example, in anti-counterfeiting of medicines or as personal signatures for artworks. In a broader sense, this talk aims to inspire a reconsideration of entropy, randomness and information in the experimental sciences through a digital lens. In doing so, it provides examples of how looking at physical systems through an information perspective can unravel new synergies, applications and even security architectures. Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://events.ccc.de/congress/2025/hub/event/detail/chaos-communication-chemistry-dna-security-systems-based-on-molecular-randomness

Der inkompetente Podcast über Dresscodes und Mode. Warum verschiedene Kleiderordnungen immer mal wieder zu komischen Situationen und politischen Missverständnissen gesorgt haben. Warum ist der Business Dress eigentlich nur ein besserer Hausanzug ? Warum wird aus gemütlicher Kleidung eine Kleidung die bei Staatsempfängen getragen wird. Warum ist ein Dresscode immer missverständlich ? Bitte zum Vortrag in smart Casual Business white Tie, aber nicht zu formal erscheinen. Wer das versteht oder auch nicht wird sich wohlfühlen. Eine kleine Reise über die merkwürdige Welt der (Männer) Mode, die halt wenig sinnvoll ist. Mode ist halt nur eine Möglichkeit sich von anderen Abzugrenzen. Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://events.ccc.de/congress/2025/hub/event/detail/och-menno-mode-power-cycles-power-suit-dresscodes-wtf

Aus einem Barwitz wurde ein Projekt! Blumenthal7 ist die letzte vollständig erhaltene Schachtanlage des ehemaligen Steinkohlebergwerks General Blumenthal in Recklinghausen im nördlichen Ruhrgebiet. Nach diversen Startschwierigkeiten ist aus einer im Dornröschenschlaf liegenden Industriebrache ein Projekt geworden, das bereits jetzt einer Vielzahl von Entitäten und Gruppen eine Heimat und einen großen, nahezu grenzenlosen Spielplatz bietet. Begleitet uns gerne auf beim Power Cycle B7…! Wir – Mitglieder des Recklinghäuser Chaostreffs c3RE – haben gemeinsam mit einigen weiteren Menschen einen weiteren Verein, den Blumenthal7 e.V., gegründet. Das Ziel ist, ein altes Steinkohlebergwerk zu kaufen, zu erhalten, zu renovieren und vielen Menschen als Raum für Chaos, Kreativität und Happenings zugänglich zu machen. Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://events.ccc.de/congress/2025/hub/event/detail/power-cycle-b7-oder-warum-kauft-man-eine-zeche

In this talk, we will give an introduction into the project (i.e. how it all started at 38c3 and why we are here now), provide an in-depth review of how the development process of our pager worked and what our future goals are. In our introduction, we will talk about the origin and exploration phase of the inital pager idea (i.e. how we went from the idea of bringing POCSAG Pager transmitter to 38c3, over a cable-bound prototype, to a first working pager on a proper PCB). We will also present our plans of connecting our POCSAG transmitter infrastructure to THOT (CERTs own dispatch software). For our in-depth review about the project, we explain how we encountered major reception problems, how we analyzed them at easterhegg22 and conducted experiments there, and why we are opting for a custom HF frontend design instead of an already-made one from chinese vendors. Moreover, we provide an overview of our transmitter devices and give some advice on how to replicate those. Lastly, we will discuss further challenges and what our next goals are. If we are reaching our milestone until 39c3, we will also give a live demo of the system. At 38c3, we conducted an experiment to test out our self-built POCSAG Pager infrastructure. Together with DL0TUH and CERT, we are now working on an open pager solution leveraging well-known components in the maker commmunity (e.g. ESP32, SX1262) to support the alarming of action forces at c3 events. In this talk, we will guide you through the process of developing such a project, problems that are occuring and what our future plans are. Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://events.ccc.de/congress/2025/hub/event/detail/chaospager-how-to-construct-an-open-pager-system-for-c3

Both within the EU as well as nationally in Germany, there exists a renewed drive to implement data retention, a practice struck down by the ECJ and discontinued in many national legislations. In parallel, cross-border access to stored data has been mandated within the EU as “e-evidence”, and will soon be extended to 90+ countries under the umbrella of the EU cybercrime convention. In principle, all data stored by service providers will be available to law enforcement as part of a criminal investigation. The timing of both initiatives is not coincidental, as access to data naturally relies on the availability of data. The talk will address the state of play on data retention in various legislations, and introduce the practice of cross border access to stored data by law enforcement as well as its shortcomings and threats to privacy and confidentiality. The Specter of Data Retention is back in the political arena, both as a harmonized, EU-wide approach as well as being part of the coalition agreement of the new German national government. Other countries have already recently implemented new data retention laws, i.e. Belgium or Denmark. In parallel, access to all types of stored data – and not only data stored under a data retention regime – by law enforcement has been radically reformed by groundbreaking new legislation, undermining both exiting national safeguards as well as protections implemented by businesses aiming for a higher standard in cyber security and data protection. The talk will give an overview on recent developments for a harmonized “minimum” approach to data retention under the Polish and Danish EU presidency as well as the new German legislation currently under consideration. It will introduce the upcoming international release mechanisms for stored data under the e-evidence legislation, the 2nd protocol to the EU cybercrime convention as well as future threats from the UN cybercrime convention. It will address how a cross-border request for information works in practice, which types of data can be requested by whom, and who will be responsible for the few remaining safeguards – including an analysis of the threat model and potential “side channel” attacks by cybercrime to gain access to basically all data stored by and with service providers. Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://events.ccc.de/congress/2025/hub/event/detail/live-die-repeat-the-fight-against-data-retention-and-boundless-access-to-data

This talk demonstrates end-to-end prompt injection exploits that compromise agentic systems. Specifically, we will discuss exploits that target computer-use and coding agents, such as Anthropic's Claude Code, GitHub Copilot, Google Jules, Devin AI, ChatGPT Operator, Amazon Q, AWS Kiro, and others. Exploits will impact confidentiality, system integrity, and the future of AI-driven automation, including remote code execution, exfiltration of sensitive information such as access tokens, and even joining Agents to traditional command and control infrastructure. Which are known as "ZombAIs", a term first coined by the presenter as well as long-term prompt injection persistence in AI coding agents. Additionally, we will explore how nation state TTPs such as ClickFix apply to Computer-Use systems and how they can trick AI systems and lead to full system compromise (AI ClickFix). Finally, we will cover current mitigation strategies and forward-looking recommendations and strategic thoughts. During the Month of AI Bugs (August 2025), I responsibly disclosed over two dozen security vulnerabilities across all major agentic AI coding assistants. This talk distills the most severe findings and patterns observed. Key highlights include: * Critical prompt-injection exploits enabling zero-click data exfiltration and arbitrary remote code execution across multiple platforms and vendor products * Recurring systemic flaws such as over-reliance on LLM behavior for trust decisions, inadequate sandboxing of tools, and weak user-in-the-loop controls. * How I leveraged AI to find some of these vulnerabilities quickly * The AI Kill Chain: prompt injection, confused deputy behavior, and automatic tool invocation * Adaptation of nation-state TTPs (e.g., ClickFix) into AI ClickFix techniques that can fully compromise computer-use systems. * Insights about vendor responses: from quick patches and CVEs to months of silence, or quiet patching * AgentHopper will highlight how these vulnerabilities combined could have led to an AI Virus Finally, the session presents practical mitigations and forward-looking strategies to reduce the growing attack surface of probabilistic, autonomous AI systems. Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://events.ccc.de/congress/2025/hub/event/detail/agentic-probllms-exploiting-ai-computer-use-and-coding-agents

Trump has staged an unscheduled, midair rapid disassembly of the global system of trade. Ironically, it is this system that prevented all of America's trading partners from disenshittifying their internet: the US trade representative threatened the world with tariffs unless they passed laws that criminalized reverse-engineering and modding. By banning "adversarial interoperability," America handcuffed the world's technologists, banning them from creating the mods, hacks, alt clients, scrapers, and other tools needed to liberate their neighbours from the enshittificatory predations of the ketamine-addled zuckermuskian tyrants of US Big Tech. Well, when life gives you SARS, you make sarsaparilla. The Trump tariffs are here, and it's time to pick the locks on the those handcuffs and set the world's hackers loose on Big Tech. Happy Liberation Day, everyone! Enshittification wasn't an accident. It also wasn't inevitable. This isn't the iron laws of economics at work, nor is it the great forces of history. Enshittification was a choice: named individuals, in living memory, enacted policies that created the enshittogenic environment. They created a world that encouraged tech companies to merge to monopoly, transforming the internet into "five giant websites, each filled with screenshots of the other four." They let these monopolists rip us off and spy on us. And they banned us from fighting back, claiming that anyone who modified a technology without permission from its maker was a pirate (or worse, a terrorist). They created a system of "felony contempt of business-model," where it's literally a crime to change how your own devices work. They declared war on the general-purpose computer and demanded a computer that would do what the manufacturer told it to do (even if the owner of the computer didn't want that). We are at a turning point in the decades-long war on general-purpose computing. Geopolitics are up for grabs. The future is ours to seize. In my 24 years with EFF, I have seen many strange moments, but never one quite like this. There's plenty of terrifying things going on right now, but there's also a massive, amazing, incredibly opportunity to seize the means of computation. Let's take it. ' Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://events.ccc.de/congress/2025/hub/event/detail/a-post-american-enshittification-resistant-internet

Mit den Prozessen im Budapest-Komplex wird ein Exempel statuiert - nicht nur gegen Einzelne, sondern gegen antifaschistische Praxis insgesamt. Die Behauptung einer kriminellen Vereinigung mit Mordabsichten stellt eine absurde juristische Eskalation des staatlichen Vorgehens gegen Antifaschist*innen dar und steht in keinem Verhältnis zu den verhandelten Vorkommnissen. Die Verfahren in dieser Weise zu verfolgen, lässt vor allem auf ein hohes Ausforschungs- und Einschüchterungsinteresse schließen. Mit dieser Prozesswelle und den Repressionen gegen Freund*innen und Angehörige wird antifaschistisches Engagement massiv kriminalisiert und ein verzerrtes Bild von politischem Widerstand gezeichnet - während gleichzeitig rechte Gewalt europaweit zunimmt und faschistische Parteien erstarken. Wir sehen, dass Angriffe auf Rechtsstaatlichkeit und Zivilgesellschaft immer weiter zunehmen. Die Art und Weise, wie gegen die Antifas im Budapest-Komplex und im Antifa-Ost Verfahren vorgegangen wird ist ein Vorgeschmack darauf, wie politische Opposition in einer autoritären Zukunft behandelt werden könnte. Wir sind alle von der rechtsautoritären Entwicklung, von Faschisierung betroffen. Die Kriminalisierung von Antifas als "terroristische Vereinigung" ist Teil einer (weltweiten) Entdemokratisierung und Zersetzung von Rechtsstaatlichkeit. Am 26. September wurde gegen Hanna vor dem OLG München das erste Urteil gegen eine der Antifaschist*innen im Rahmen des Budapest-Komplexes gefällt: 5 Jahre für ein lediglich auf Indizien basierendes Urteil. Dem Mordvorwurf der Staatsanwaltschaft wurde nicht entsprochen, behauptet wurde aber die Existenz einer gewalttätigen „kriminellen Vereinigung“. Am 12. Januar 2026 wird nun vor dem OLG Düsseldorf der Prozess gegen Nele, Emmi, Paula, Luca, Moritz und Clara, die seit Januar in verschiedenen Gefängnissen in U-Haft sitzen, eröffnet. Die Anklage konstruiert auch hier eine kriminelle Vereinigung nach §129 und enthält den Vorwurf des versuchten Mordes. Die Verfahren in dieser Weise zu verfolgen, lässt vor allem auf ein hohes Ausforschungs- und Einschüchterungsinteresse schließen. Zaid, gegen den ein europäischer Haftbefehl aus Ungarn vorliegt, war Anfang Mai unter Meldeauflagen entlassen worden; aufgrund seiner nicht-deutschen Staatsangehörigkeit hatte der Generalbundesanwalt keine Anklage gegen ihn erhoben. Da er in Deutschland nach wie vor von einer Überstellung nach Ungarn bedroht ist, hält er sich seit Oktober 2025 in Paris auf. Er ist gegen Auflagen auf freiem Fuß. Ein weiteres Verfahren im Budapest- Komplex wird in Dresden zusammen mit Vorwürfen aus dem Antifa Ost Verfahren verhandelt. Der Prozess gegen Tobi, Johann, Thomas (Nanuk), Paul und zwei weitere Personen wird bereits im November beginnen. In Budapest sitzt Maja – entgegen einer einstweiligen Verfügung des BVerfG und festgestellt rechtswidrig im Juni 2024 nach Ungarn überstellt - weiterhin in Isolationshaft; der Prozess soll erst im Januar fortgeführt werden und voraussichtlich mit dem Urteil am 22.01. zu Ende gehen. Mit den Prozessen im Budapest-Komplex wird ein Exempel statuiert – nicht nur gegen Einzelne, sondern gegen antifaschistische Praxis insgesamt. Die Behauptung einer kriminellen Vereinigung mit Mordabsichten stellt eine absurde juristische Eskalation des staatlichen Vorgehens gegen Antifaschist*innen dar und steht in keinem Verhältnis zu den verhandelten Vorkommnissen. Mit dieser Prozesswelle und den Repressionen gegen Freund*innen und Angehörige wird antifaschistisches Engagement massiv kriminalisiert und ein verzerrtes Bild von politischem Widerstand gezeichnet – während gleichzeitig rechte Gewalt europaweit zunimmt und faschistische Parteien erstarken. Wir sehen, dass Angriffe auf Rechtsstaatlichkeit und Zivilgesellschaf immer weiter zunehmen. Die Art und Weise, wie gegen die Antifas im Budapest-Komplex vorgegangen wird, ist ein Vorgeschmack darauf, wie politische Opposition in einer autoritäreren Zukunft behandelt werden könnte. Wir sind alle von der rechtsautoritären Entwicklung, von Faschisierung betroffen. Die Kriminalisierung von Antifas als „terroristische Vereinigung" ist Teil einer (weltweiten) Entdemokratisierung und Zersetzung von Rechtsstaatlichkeit. Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://events.ccc.de/congress/2025/hub/event/detail/selbstverstandlich-antifaschistisch-aktuelle-informationen-zu-den-verfahren-im-budapest-komplex-von-family-friends-hamburg

„They Talk Tech“ Live: Podcasts-Hosts Svea Eckert und Eva Wolfangel diskutieren mit Anne Roth, Referentin für Digitalpolitik der Linksfraktion, Netzaktivistin, scharfe Beobachterin und präzise Analytikerin digitaler Machtstrukturen, über Überwachung, digitale Freiheitsrechte, feministische Netzpolitik und die politischen Kämpfe hinter der Technologie. Anne Roth beschäftigt sich seit vielen Jahren mit staatlichen Sicherheitsarchitekturen, Geheimdienstkontrolle, digitaler Gewalt und Fragen politischer Teilhabe. Im Gespräch geht es um die Mechanismen digitaler Macht, um Freiheitsrechte im Zeitalter permanenter Datenerfassung und darum, wie politische Entscheidungen technologische Entwicklungen prägen und umgekehrt - und wo die netzpolitische Community auch in politisch schwierigen Zeiten ansetzen kann, um die Entwicklung positiv zu beeinflussen. Eine offene, präzise und lebendige Diskussion, die sowohl technisch interessierte als auch politisch denkende Menschen abholt. Live und mit Raum für eure Fragen. "They Talk Tech" ist ein c't-Podcast von Svea Eckert und Eva Wolfangel Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://events.ccc.de/congress/2025/hub/event/detail/they-talk-tech-live-mit-anne-roth

It is 1976 and the USA long stopped going to the Moon when a Soviet automatic landing station called Luna 24 descends to the Lunar surface. It touches down on 3.3 Billion year old rock formations at a place no mission has ever gone before. What exactly happened remains a mystery to this day, but the space probe managed to take a 2.3 m long drill core from the Lunar regolith, packaged the sample in a genius way and launched it for its voyage to Earth. Some days later the sample entered earths atmosphere and landed in remote Siberia and ended up in our hands more than 50 Years later. We tell the story of the sample, the people that brought it to Earth and how we analyzed it with the newest methods including µm sized high intensity X-ray beams, 30kV electron beams and LN2 cooled infrared spectrometers. In this talk, members of the Museum for Natural History in Berlin will present the story of a Luna 24 sample retrieved by the GDR from the USSR. The sample has been almost "lost" to time. When it fell into our hands, we started understanding its historical and scientific significance, produced specialized sample containers and initiated curation efforts of the sample while slowly understanding its history and geochemical composition. ### Luna 24 Moon Mission What happened on the 18th & 19th of August 1976 on the moon? Why was this landing site chosen and how was the sample retrieved and brought back to Earth? Which way did the scientists handle these extremely precious samples? Picture: Музей Космонавтики (CC0 1.0) ### Methods and Results Which methods can be utilized to gather new information from such a sample without destroying it? Which storage and curation methods must be used to preserve its value for the scientists that come after us? How did advanced analytical methods like µCT, electron microscopes, µ X-ray fluorescence spectrometers and nitrogen-cooled infrared spectrometers contribute to our understanding of the sample? Fly with us to the moon! This work has been developed together with Christopher Hamann. Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://events.ccc.de/congress/2025/hub/event/detail/a-space-odyssey-2-how-to-study-moon-rocks-from-the-soviet-sample-return-mission-luna-24

Bei "Off The Record" nehmen wir euch mit in den Maschinenraum von netzpolitik.org. Einmal im Monat geben Redakteur:innen und andere Team-Mitglieder Einblicke in ihre Arbeit. Bei dieser Live-Ausgabe zum Abschluss des Jahres wollen wir hinter die Kulissen einiger große Recherchen blicken: Es geht um Spionage-Apps und Datenhändler, eine mysteriöse Schallwaffe und die Tücken der Verwaltungsdigitalisierung. In "Off/On", dem Podcast von netzpolitik.org, wechseln sich zwei Formate ab: Bei "Off The Record" geht es ab in den Maschinenraum von netzpolitik.org: Wir erzählen, wie unsere Recherchen entstehen, und machen transparent, wie wir arbeiten. Bei "On The Record" interviewen wir Menschen, die unsere digitale Gesellschaft prägen. Bei dieser Live-Ausgabe von "Off The Record" spricht Ingo Dachwitz mit Chris Köver, Markus Reuter und Esther Mehnhard über ihre Recherchen des Jahres. Wie sind sie bei der Recherche vorgegangen? Welche Hindernisse mussten sie überwinden? Wie verpackt man komplexe Sachverhalten am besten? Und was haben die Recherchen ausgelöst? Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://events.ccc.de/congress/2025/hub/event/detail/netzpolitikorg-offon-off-the-record-live