$ ssh-keygen -p [-P old_passphrase] [-N new_passphrase] [-f keyfile]

nhanpt5@CPU10876-local:~$ ssh-keygen -p -P 123456 -N “” -f ~/.ssh/id_rsa
Key has comment ‘/home/nhanpt5/.ssh/id_rsa’
Your identification has been saved with the new passphrase.

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