Change SSH Key Passphrase
To change SSH key passphrase, run
ssh-keygen -p -f ~/.ssh/id_rsa
Example
root@ok:~/.ssh# ssh-keygen -p -f ~/.ssh/id_rsa Enter new passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved with the new passphrase. root@ok:~/.ssh#
See ssh-keygen