39C3: Power Cycles (2025)

27–30 December 2025

CCH – Congress Center Hamburg, Congressplatz 1, 20355 Hamburg

Website: https://events.ccc.de/congress/2025/

39C3: Congress Everywhere

39C3: Congress Everywhere

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Once again this year, hackspaces and other locations are offering a place to meet, stream Congress talks, hack, have a party and more. Congress is everywhere where people bring it to life. It’s also possible to visit one another.

These Congress Everywhere locations are known to us:

City Organiser / Website Day 1 / 27 Dec Day 2 / 28 Dec Day 3 / 29 Dec Day 4 / 30 Dec
Aachen CCCAC from 11:00 from 11:00 from 11:00 from 11:00
Basel (CH) CCC Basel from 13:00 from 13:00 from 13:00 from 13:00
Berlin Näh’n’Nerdcafe from around 13:00 from around 13:00 from around 13:00 from around …
39C3: School Gymnasiums – the affordable option for sleeping accommodation

39C3: School Gymnasiums – the affordable option for sleeping accommodation

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Good news: Once again we were able to convince some nearby schools to let us use their gymnasiums as sleeping spaces. Tickets will cost 5 € per night. They will be sold at the cashdesk from day 0 until day 4, starting at 18:00. Each evening, tickets will be sold for the current night only.

We have reserved a special allocation for angels who have worked some shifts. Gymnasium tickets for angels will be available at Heaven at all times and for more than just the current day.

Showers and toilets will be available on site, you need to bring your own camping mat and sleeping bag.

Please note: …

39C3: Lightning Talks

39C3: Lightning Talks

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TL;DR

  • There will be two lightning talk sessions
  • You can submitt your talk here: https://cfp.cccv.de/39c3-lightningtalks/cfp
  • Dedicated block for talks related to sustainability
  • 5 minutes for a talk
  • Submissions only with slides
  • First come, first served! (The exception proves the rule.)

Your chance is here!

Have you always wanted to stand in front of a large audience and bring your knowledge, incredible experience, projects, ideas, hacks, or stories to the stage? Now is your chance! The Lightning Talks at 39C3 open the floodgates for you.

Here are the rules:

  • You have 5 minutes for your …
‘"A brown stuffed squirrel sits on an assembly table at Congress. It wears green 3D-printed cat ears and holds a small roll of paper in its hand. In the background, telephones and seated people can be seen."

Awareness, Auti, Accessibility auf dem 39C3

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TL;DR

  • Various support structures are available for you at 39C3.
  • Awareness: e.g. in cases of discrimination, boundary violations, harassment and (sexualised) violence.
  • c3auti: Needs and problems of neurodivergent beings
  • Accessibility: easy access and minor support issues on site.
  • Contact details can be found in the text below and at help.ccc.de.
  • In addition, CERT is available for medical care, CrewCrew for security issues and the arbitration board for serious conflicts.
  • Please read the principles.

All Creatures Welcome

“What brings us together is not what we already know, but what we still …

39C3: Self-organized Sessions

39C3: Self-organized Sessions

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TL;DR

  • Workshops, group meetings, short talks, … – Our collective term for all of these is Self-organized Sessions.
  • You can create Self-organized Sessions already, but dedicated rooms will become bookable gradually this time. The start date for each round has now been determined, see below!
  • An overview of all Self-organized Sessions can be found in the Hub.
  • If you are interested in a session, log in and mark it as a favourite – this helps us estimate how large the room needs to be.
  • To create new sessions yourself, use the Hub’s Backoffice.
  • Assemblies can decide whether they want to open their …
Secure your eye-catching Congress merch now!

Secure your eye-catching Congress merch now!

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The word’s on the street that you can now stock up on amazing cloth in the official 39C3 look at our merch store.

In addition to the traditional black, this year’s shirts, zippers, hoodies, and sweatshirts are also available in spring-like shades of misty jade, lavender, and natural raw, in joyful anticipation of future camps. And to top it all off, you can adorn your heads with 39C3-themed embroidered beanies and your kids’ necks with uber-nerdy bibs. And for those who want to shine with subtle hacker shibboleth textiles even in formal settings, there is a lovingly …

screenshot of the 39C3 schedule

Timetables for 39C3, hot off the press: The Fahrplan is out

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After the halfnarp is before the schedule. Thanks to you, and thanks to the many helping hands of the content teams, we can now present to you the first version of the 39C3 Fahrplan!

The official stage programme at the 39th Chaos Communication Congress starts on 27 December, 10:30 with the opening ceremony and shines with a total of 165 talks. These have been lovingly sorted and curated for you into seven topical tracks. There is definitely something for everyone!

To those of you who now have counted manually or even found the gaps in the schedule: That’s right, because we have a few surprise …

Einladung zum Junghacker:innentag auf dem 39C3

Einladung zum Junghacker:innentag auf dem 39C3

DE

Hinweise für Mithelfende und Veranstalter am Ende des Textes!

Junghacker:innen-Tag - sei dabei!

Zu unserer Freude haben sich in den letzten Jahren immer mehr Junghacker:innen auf dem Congress eingefunden. Daher bieten wir auch diesmal, wie schon in den Vorjahren, einen speziell auf Kinder und Jugendliche zugeschnittenen Junghacker:innentag an. Am zweiten Congresstag, dem 28. Dezember 2025, organisieren Freiwillige aus vielen Assemblies von etwa 10 bis 17 Uhr ein vielseitiges Workshop-Programm für angehende Hacker:innen.

Wer schon immer mal löten, programmieren, einen 3D-Drucker ausprobieren, …

The picture shows a purple figure with tusks and a trunk coming out of soap bubbles. She has a light green mohawk with sideburns and is wearing a dark blue sailor jacket with gold buttons. A baby crocodile with a red pacifier and green cat ears is sleeping on her lap. Next to the crocodile is a laptop with a fishbone sticker. Two red and white striped chimneys are enthroned on the monitor.

39C3 – Creature ChroniCles Update

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TL;DR

What has changed, in short: In response to the very clear reactions to the exception, the project “Creature ChroniCles” will now be governed by the photo policy in its familiar form. Before every photo, everyone involved will be asked for their consent.

Creature ChroniCles reloaded

In the pre-Congress stress, some things and details unfortunately get lost that seem natural for the people involved, while for others they are far from clear and unambiguous. That did happen to us with the blog article on the “Creature ChroniCles” project. We were too much trapped in our inside view. Most of …

View of an interpreting booth during 38C3 at the CCH in Hamburg. On a table, technology for interpreting can be seen in the form of headsets and consoles, as well as water bottles and drinking glasses. In the background, hall 1 of the CCH can be made out through a window.

Call for Interpreters: Translate 39C3!

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Planning for Congress, unsure what to do there, interested in applying your impressive language skills? If you are multilingual and fluent in German, English and maybe other languages, please consider joining the interpreters team, c3lingo.

We interpret ALL talks in the four main halls live and in real-time. German talks are interpreted into English, and vice versa. Our work is streamed to the Internet and transmitted as audio-only streams in the halls, and recordings are published on media.ccc.de. We have another channel where we interpret into more languages, this is transmitted and …

39C3: Call for Angels

39C3: Call for Angels

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39C3 needs your help! No Congress would be possible without the many volunteers, called Angels (German: Engel).

Whether you’re participating for the first time or have already experienced many cycles, helping as an Angel is always a great way to meet new beings, get a look behind the scenes, and create unforgettable experiences for yourself and others.

If you’d like to help, register in the Engelsystem. After your arrival at Congress, come to the Angel registration on the right side of the entrance hall. There you’ll receive your Angel badge and can then freely sign up for shifts for upcoming …

The image shows two Creatures in the centre. Unlike the rest of the photo, these were drawn by hand. The figure on the left, with gray skin, has purple dreadlocks, pointed fairy ears, fangs, and large sunglasses. Its arm is around the figure next to it. This figure has yellow skin and flaming hair. It wears welding goggles and has an orange mustache. In the background is a nested room made of light-coloured brick.

Creature ChroniCles – Artistic documentation of the 39C3

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Update

There is an update to this post available.

Original

This year at 39C3, there will be photos of the Congress with hand-drawn figures. All persons will be digitally overdrawn and thus anonymized. This is an exception to the photo policy. “Creature ChroniCles” is an artistic pictorial documentation of Congress events. Graphic designer Stella (known for her Congress designs for 33C3 and 35C3 and for Camp23) will take photos of interesting scenes and nice interactions/installations throughout the entire duration of 39C3 and then anonymize all persons represented in the photos by painting …