SSH Authentication with a CA
This article describes how to use a SSH CA to authenticate to SSH servers. This is particularly useful when you have a lot of servers to manage and you want to avoid the hassle of managing a lot of SSH keys.
The basic idea is to have a CA (Certificate Authority) that will sign the public keys of the users. Then, the users will be able to authenticate to the servers using their signed public key. This way, you don't have to manage the public keys of the users on the servers, you only have to manage the public keys of the CA. You can also limit the validity of the signed public keys to a certain amount of time or to a certain set of servers and users.