diff --git a/src/tlv.hpp b/src/tlv.hpp
new file mode 100644
index 0000000..92f2f4e
--- /dev/null
+++ b/src/tlv.hpp
@@ -0,0 +1,44 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+* Copyright (c) 2013-2014 Regents of the University of California.
+*
+* This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
+*
+* ndn-cxx library 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.
+*
+* ndn-cxx library 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 Lesser General Public License for more details.
+*
+* You should have received copies of the GNU General Public License and GNU Lesser
+* General Public License along with ndn-cxx, e.g., in COPYING.md file.  If not, see
+* <http://www.gnu.org/licenses/>.
+*
+* See AUTHORS.md for complete list of ndn-cxx authors and contributors.
+*/
+
+#ifndef NDN_GEP_TLV_HPP
+#define NDN_GEP_TLV_HPP
+
+namespace ndn {
+namespace gep {
+namespace tlv {
+
+enum {
+  EncryptedContent = 130,
+  EncryptionAlgorithm = 131,
+  EncryptedPayload = 132
+};
+
+enum AlgorithmTypeValue {
+  AlgorithmSha256WithRsa = 0,
+  AlgorithmSha256WithEcdsa = 1
+};
+
+} // namespace tlv
+} // namespace gep
+} // namespace ndn
+
+#endif // NDN_GEP_TLV_HPP