Sharing public keys
To be able to login into our shared server, you need to share your PUBLIC key publicly - which is paired with your PRIVATE key saved locally on your computer (which you never share with anyone, and can be additionally password-protected).
Your PUBLIC key can be shared via our pad: https://pads.ccc.de/servlab
You can read a bit more about asymmetric encryption here.
You can use Linux-based ssh-keygen or other solutions. More on its use is available here.