Deleting unnecessary keys on the server after ssh-copy-id - where and how to delete?

Question

linux

If someone sent their key to my server via ssh-copy-id (so that later I can log in without a password) where can I see all these keys, who sent them and how to remove unnecessary ones?

Answer 1

~/.ssh/authorized_keys
/etc/ssh/sshd_config
has an option

# The default is to check both .ssh/authorized_keys and .ssh/authorized_keys2
# but this is overridden so installations will only check .ssh/authorized_keys
#AuthorizedKeysFile     .ssh/authorized_keys