This procedure allow to log-in to a ubuntu server with openssh without writing the password every time you access.

Generation of the key:

client$ mkdir ~/.ssh client$ chmod 700 ~/.ssh

client$ ssh-keygen -q -f ~/.ssh/id_rsa -t rsa

Enter passphrase (empty for no passphrase): …

Enter same passphrase again: …

Key protection on the client:

client$ chmod 700 ~/.ssh