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diff --git a/sca-cpp/branches/lightweight-sca/hosting/server/authn.py b/sca-cpp/branches/lightweight-sca/hosting/server/authn.py
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+#  Licensed to the Apache Software Foundation (ASF) under one
+#  or more contributor license agreements.  See the NOTICE file
+#  distributed with this work for additional information
+#  regarding copyright ownership.  The ASF licenses this file
+#  to you under the Apache License, Version 2.0 (the
+#  "License"); you may not use this file except in compliance
+#  with the License.  You may obtain a copy of the License at
+#  
+#    http://www.apache.org/licenses/LICENSE-2.0
+#    
+#  Unless required by applicable law or agreed to in writing,
+#  software distributed under the License is distributed on an
+#  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+#  KIND, either express or implied.  See the License for the
+#  specific language governing permissions and limitations
+#  under the License.
+
+# User authenticator implementation
+from time import strftime
+from util import *
+
+# Convert a particular user id to an authentication id
+def authnid(id):
+    return append(append(('authn',), id), ('user.authn',))
+
+# Get a user's authentication
+def get(id, cache):
+    authn = cache.get(authnid(id))
+    if isNil(authn) or authn is None:
+        return None
+    return authn
+
+# Update a user's authentication
+def put(id, authn, cache):
+    return cache.put(authnid(id), authn)
+
+# Delete a user's authentication
+def delete(id, cache):
+    return cache.delete(authnid(id))
+