#If you already have an SSH key, you can skip this step… Just hit Enter for the key and both passphrases:

$ ssh-keygen -t rsa -b 2048
Generating public/private rsa key pair.
Enter file in which to save the key (/home/username/.ssh/id_rsa): 
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /home/username/.ssh/id_rsa.
Your public key has been saved in /home/username/.ssh/id_rsa.pub.

# Copy your keys to the target server:

$ ssh-copy-id [email protected]
[email protected]'s password: 

# Now try logging into the machine, with ssh '[email protected]', and check in:

.ssh/authorized_keys

# to make sure we haven’t added extra keys that you weren’t expecting.
# Finally check logging in…

$ ssh [email protected]

[email protected]:~$ 

# You may also want to look into using ssh-agent if you want to try keeping your keys protected with a passphrase.