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Authenticate with an X.509 certificate
Authentication with an X.509 certificate is possible in two modes: "full" and "key-only". In both modes you need to create an instance of TElSSHKey, then use TElSSHKey.Import() method.
In Full mode the certificate is sent to the server. This mode assumes that the server can handle certificate authentication.
In Key-only mode only the keypair is used. This works with servers that don't support certificates. To use key-only mode you need to set CertAuthMode property of the component to TSBSSHCertAuthMode.camRawPublicKey .
After doing the above please follow the instructions for key-based authentication.