The cryptoportal for teachers, called "Teachers portal", offered teachers a platform on which they could publish, exchange and discuss teaching materials about information security and cryptology.
The teacher portal was discontinued due to a lack of new contributions. Many of the teaching materials can still be found here: https://informatik.schule.de/krypto
You can find similar content here:
- http://www.informatik-im-kontext.de
- https://www.4teachers.de
- https://informatik.bildung-rp.de/online-lehrbuch.html
- http://www.inf-schule.de
- https://unterrichten.zum.de/wiki/JavaScript/Cäsar_Chiffre
With kind regards, the CrypTool team