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Changing the passphrase of an OpenSSH key
At some point, you may want to change the passphrase associated with a key. If 
you'd like to do that, you can use the 
-p
 argument with the 
ssh-keygen
 command. 
That same argument can also be used if you didn't choose to add a passphrase when 
you initially created the key. That's all there is to it. The command you'd enter to add 
or change a passphrase is as simple as the following:
ssh-keygen -p 
Once you enter that command, press 
Enter
 to accept the default file (
id_rsa
) unless 
the key you want to alter is under a different name, in which case you can type the 
path to, and the name of, that key. Then, you'll be asked for your current passphrase 
(leave it blank if you don't have one yet) followed by your new passphrase twice. 
The process looks like this:
Figure 10.11: Changing an SSH passphrase
These concepts may take a bit of practice if you've never used SSH before. The best 
way to practice is to set up multiple Ubuntu Server installations (perhaps several 
virtual machines), and practice using SSH to connect to them, as well as deploying 
your key to each machine via the 
ssh-copy-id
 command. It's actually quite easy once 
you get the hang of it.