I teach some K-14 students in programming and we are using the micro:bit to do several smaller projects. Last week they asked me if I could teach them how to hack computers. This cought my interest and I did some short research. I came up with a talk at DEF CON 25 how to use the micro:bit to sniff wireless keyboards.
This was even for my knowledge to complex. So I was looking for something more simple. Not really hacking, but in the wider security context I thought about doing a 2-way authentication project using the micro:bit.
If you have an idea that could fit in this topic I'd love to hear it. Thanks in advance.