def get_authentication_keys_proxy_manager(self):
raise errors.Unimplemented()<EOL>
Gets an ``AuthenticationKeysProxyManager``.

        return:
                (osid.authentication.keys.AuthenticationKeysProxyManager
                ) - an ``AuthenticationKeysProxyManager``.
        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``.*