No more OPIE OTP.
The only way to log in now is SSH keys, such as those generated by:
ssh-keygen -t rsa
You must use a strong passphrase, such as those generated by:
shuf -n 4 /usr/share/dict/words | tr -d '\n\047';echo
The "public key" is actually a lock, and is the only thing you should send.
cat ~/.ssh/id_rsa.pub