Under section "7.1 Grundlagen" the link for "Diffie-Hellman" pointing to http://www.hack.gr/users/dij/crypto/overview/diffie.html fails to load with error 404.
STOP! http://www.gentoo.de/main/de/kontakt.xml gentoo.de != gentoo.org
This problem also occured with gentoo.org in the german translation as well as the english original: The host seems to be down, I could see a google cache of the page - we might want to consider of providing a different link.
Let's just link to wikipedia instead. It's already available in several languages.
Fixed. Thanks.