diff --git a/access_control_manager.py b/access_control_manager.py
new file mode 100644
index 0000000..53ed12d
--- /dev/null
+++ b/access_control_manager.py
@@ -0,0 +1,26 @@
+# -*- Mode:python; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
+#
+# Copyright (C) 2014 Regents of the University of California.
+# Author: Teng Liang <philoliang2011@gmail.com>
+# 
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+# A copy of the GNU General Public License is in the file COPYING.
+
+"""
+This module uses access token method to sign, verfy, encrypt and decrypt data/interest. Besides, it generates and updates seed/command access token/access token. 
+
+"""
+
+class AccessControlManager(object):
+    pass