How to Find Out Which SSH Key Was Used to Login

Check who logged to linux machine

sudo journalctl  --unit ssh

sudo cat /var/log/auth.log

Inspect-keys

=== "command"

```bash
ssh-keygen -l -f ~/.ssh/authorized_keys
```

=== "output"

```console
$ ssh-keygen -l -f ~/.ssh/authorized_keys
256 SHA256:wXXXXXXXXXXXXXXXXXXXXXXWiK9MRm6OhgE durbok (ED25519)
2048 SHA256:JQgAXXXXXXXXXXXXXXXXXXXy2np3hxcs [email protected] (RSA)
```

Inspect-ur-own-key-fingerprint

=== "command"

```bash
ssh-keygen -l -f ~/.ssh/id_ed25519.pub
```

=== "output"

```console
$ ssh-keygen -l -f ~/.ssh/id_ed25519.pub
256 SHA256:iXXXXXXXXXXXXXXXXXXXp290qAx05sN8U some_user (ED25519)
```