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://bscw.schule.de/pub/bscw.cgi/159132
You can find similar content here:
With kind regards, the CrypTool team