OL08-00-010100 - OL 8, for certificate-based authentication, must enforce authorized access to the corresponding private key.
If an unauthorized user obtains access to a private key without a passcode, that user would have unauthorized access to any system where the associated public key has been installed. NOTE: Nessus has not performed this check. Please review the benchmark to ensure target compliance.
Create a new private and public key pair that uses a passcode with the following command: $ sudo ssh-keygen -n [passphrase]