Intro auth exercise: how do you know I'm the teacher? #33

Ask the students: how do you know I'm the teacher for this lecture?

This should be asynchronous. But I can use FeedbackFruits for the students to discuss it.

Possible ways to authenticate: I'm the same as with Sonja. How do they know I'm the same? Deep-fake? How do you know Sonja was the one to teach that lecture?