diff --git a/src/encoding/tlv-security.hpp b/src/encoding/tlv-security.hpp
new file mode 100644
index 0000000..1a522ce
--- /dev/null
+++ b/src/encoding/tlv-security.hpp
@@ -0,0 +1,29 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2013, Regents of the University of California
+ *
+ * BSD license, See the LICENSE file for more information
+ *
+ * Author: Yingdi Yu <yingdi@cs.ucla.edu>
+ */
+
+#ifndef NDN_TLV_SECURITY_HPP
+#define NDN_TLV_SECURITY_HPP
+
+#include "tlv.hpp"
+
+namespace ndn {
+namespace tlv {
+namespace security {
+
+enum {
+  IdentityPackage    = 128,
+  KeyPackage         = 129,
+  CertificatePackage = 130
+};
+
+} // namespace security
+} // namespace tlv
+} // namespace ndn
+
+#endif // NDN_TLV_SECURITY_HPP