Чтобы не забыть:
Далее вносим изменения в /etc/ssh/sshd_config
ssh-keygen -t rsa -b 2048
cp id_rsa.pub authorized_keys
cp id_rsa.pub authorized_keys
Далее вносим изменения в /etc/ssh/sshd_config
PermitRootLogin no
RSAAuthentication yes
PubkeyAuthentication yes
AuthorizedKeysFile .ssh/authorized_keys
PasswordAuthentication no
PermitEmptyPasswords no
ChallengeResponseAuthentication no
RSAAuthentication yes
PubkeyAuthentication yes
AuthorizedKeysFile .ssh/authorized_keys
PasswordAuthentication no
PermitEmptyPasswords no
ChallengeResponseAuthentication no