diff --git a/tacker/vnfm/infra_drivers/kubernetes/kubernetes_driver.py b/tacker/vnfm/infra_drivers/kubernetes/kubernetes_driver.py
index 8b1e22739..8097db19e 100644
--- a/tacker/vnfm/infra_drivers/kubernetes/kubernetes_driver.py
+++ b/tacker/vnfm/infra_drivers/kubernetes/kubernetes_driver.py
@@ -531,7 +531,7 @@ class Kubernetes(abstract_driver.VnfAbstractDriver,
         return auth_cred, file_descriptor
 
     def _create_ssl_ca_file(self, auth_attr):
-        ca_cert = auth_attr['ssl_ca_cert']
+        ca_cert = utils.none_from_string(auth_attr.get('ssl_ca_cert'))
         if ca_cert is not None:
             file_descriptor, file_path = \
                 self.kubernetes.create_ca_cert_tmp_file(ca_cert)
diff --git a/tacker/vnfm/vim_client.py b/tacker/vnfm/vim_client.py
index e07042dfd..59b739a3c 100644
--- a/tacker/vnfm/vim_client.py
+++ b/tacker/vnfm/vim_client.py
@@ -20,6 +20,7 @@ from oslo_config import cfg
 from oslo_log import log as logging
 
 
+from tacker.common import utils
 from tacker import context as t_context
 from tacker.extensions import nfvo
 from tacker.keymgr import API as KEYMGR_API
@@ -85,8 +86,7 @@ class VimClient(object):
                                  vim_auth,
                                  vim_auth['bearer_token'])
         # decode ssl_ca_cert
-        if ('ssl_ca_cert' in vim_auth) and \
-                (vim_auth['ssl_ca_cert'] is not None):
+        if utils.none_from_string(vim_auth.get('ssl_ca_cert')) is not None:
             vim_auth['ssl_ca_cert'] = self.\
                 _decode_vim_auth(vim_info['id'],
                                  vim_auth,