I havent’t wrote in a while. To keep it short: I’m still alive.
This is just a short note on ssh keygen and ssh-copy which I was not aware of.
Let’s assume you have your keys an need to change the passphrase:
(keys can be ~/.ssh/id_rsa.pub or ~/.ssh/id_dsa.pub)
ssh-keygen -f id_dsa -p
And copy the key to remote host:
ssh-copy-id -i USER@REMOTE_HOST
That’s it 🙂 now you can connect to the remote machine without hassle.