def get_authentication_keys_manager(self):
raise Unimplemented()<EOL>
Gets an ``AuthenticationKeysManager``.

        return: (osid.authentication.keys.AuthenticationKeysManager) -
                an ``AuthenticationKeysManager``.
        raise:  OperationFailed - unable to complete request
        raise:  Unimplemented - ``supports_authentication_keys()`` is
                ``false``
        *compliance: optional -- This method must be implemented if
        ``supports_authentication_keys()`` is ``true``.*