Signed keys. Here's an example of how to do it from Digital Ocean: https://www.digitalocean.com/community/tutorials/how-to-create-an-ssh-ca-to-validate-hosts-an

Signed keys. Here's an example of how to do it from Digital Ocean: https://www.digitalocean.com/community/tutorials/how-to-create-an-ssh-ca-to-validate-hosts-and-clients-with-ubuntu https://www.digitalocean.com/community/tutorials/how-to-crea...