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".