diff --git a/n2vc/exceptions.py b/n2vc/exceptions.py
index f5c9fb0..4e44f95 100644
--- a/n2vc/exceptions.py
+++ b/n2vc/exceptions.py
@@ -38,3 +38,11 @@
 
 class AuthenticationFailed(Exception):
     """The authentication for the specified user failed."""
+
+
+class InvalidCACertificate(Exception):
+    """The CA Certificate is not valid."""
+
+
+class NotImplemented(Exception):
+    """The method is not implemented."""