SSH server's key is the key you see the fingerprint for when you connect to a different server for the first time. This key's identity is used to make sure you are logging in to the SSH you intend to use.
The keys a SSH server uses to identify itself when you login to it are located in /etc/ssh/ and are named something like ssh_host_rsa_key.
By default, ssh-keygen will create a key for the current user, which, by default, will be stored in ~/.ssh. The format of a user key and a server key is the same; the difference is where they are placed . When you install the openssh-server package, it automatically generates keys for the server to use.
To see the fingerprint of the SSH server's RSA key, run the command : sudo ssh-keygen -lf /etc/ssh/ssh_host_rsa_key.
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