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The 25th Chaos Communication Congress (25C3) is the annual four-day conference organized by the Chaos Computer Club (CCC). It takes place at the bcc Berliner Congress Center in Berlin, Germany. The Congress offers lectures and workshops on a multitude of topics and attracts a diverse audience of thousands of hackers, scientists, artists, and utopians from all around the world. The 25C3s slogan is "Nothing to hide".

   25C3: Nothing to hide
   25th Chaos Communication Congress
   December 27th to 30th, 2008
   bcc Berliner Congress Center, Berlin, Germany

Here you find a overview of the areas, activities and some projects at 25C3. As this website is part of a wiki you can contribute information, too. Login or register an account and go ahead. Refer to this help page for information about using a MediaWiki.








Get in touch

Please consult this Wiki first as your question might already have an answer.

Contact email adresses

You can contact the organizers via the following email adresses:

  • 25C3-orga (at) for organisational issues
  • 25C3-content (at) for conference program and other content/cfp-related stuff
  • 25C3-press (at) for press and pr issues

Contact 25C3 Abuse Handling

If you experience network security problems that are clearly originating at the 25. Chaos Communication Congress network (IP range not known by now), please contact us at the number which will be announced shortly before the start of our event. We will immediately try to resolve the problem by technical measures on our site. This number is ONLY for the purpose of reporting serious network security problems, all other requests will NOT be answered at this number.

For general contact information (press, general Information etc.) use our general contact information!


congress (at) is the mailinglist for general discussion about the Congress. To subscribe, send mail to congress-subscribe (at)

Archived page - Impressum/Datenschutz