diff --git a/tools/ndnsec/main.cpp b/tools/ndnsec/main.cpp
new file mode 100644
index 0000000..ae81752
--- /dev/null
+++ b/tools/ndnsec/main.cpp
@@ -0,0 +1,114 @@
+/* -*- 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.
+ *
+ * @author Yingdi Yu <http://irl.cs.ucla.edu/~yingdi/>
+ */
+
+#include "version.hpp"
+
+#include "util.hpp"
+#include "list.hpp"
+#include "get-default.hpp"
+#include "set-default.hpp"
+#include "key-gen.hpp"
+#include "dsk-gen.hpp"
+#include "sign-req.hpp"
+#include "cert-gen.hpp"
+#include "cert-revoke.hpp"
+#include "cert-dump.hpp"
+#include "cert-install.hpp"
+#include "export.hpp"
+#include "import.hpp"
+#include "delete.hpp"
+#include "sig-verify.hpp"
+#include "set-acl.hpp"
+#include "unlock-tpm.hpp"
+#include "op-tool.hpp"
+
+using namespace ndn;
+
+std::string ndnsec_helper("\
+  help         Show all commands.\n\
+  version      Show version and exit.\n\
+  list         Display information in PublicInfo.\n\
+  get-default  Get default setting info.\n\
+  set-default  Configure default setting.\n\
+  key-gen      Generate a Key-Signing-Key for an identity.\n\
+  dsk-gen      Generate a Data-Signing-Key for an identity.\n\
+  sign-req     Generate a certificate signing request.\n\
+  cert-gen     Generate an identity certificate.\n\
+  cert-revoke  Revoke an identity certificate.\n\
+  cert-dump    Dump a certificate from PublicInfo.\n\
+  cert-install Install a certificate into PublicInfo.\n\
+  delete       Delete identity/key/certificate.\n\
+  export       Export an identity package.\n\
+  import       Import an identity package.\n\
+  sig-verify   Verify the signature of a Data packet.\n\
+  set-acl      Configure ACL of a private key.\n\
+  unlock-tpm   Unlock Tpm.\n\
+  op-tool      Operator tool.\n\
+");
+
+int
+main(int argc, char** argv)
+{
+  if (argc < 2)
+    {
+      std::cerr << ndnsec_helper << std::endl;
+      return 1;
+    }
+
+  std::string command(argv[1]);
+
+  try
+    {
+      if (command == "help")              { std::cout << ndnsec_helper << std::endl; }
+      else if (command == "version")      { std::cout << NDN_CXX_VERSION_BUILD_STRING
+                                                      << std::endl; }
+      else if (command == "list")         { return ndnsec_list(argc - 1, argv + 1); }
+      else if (command == "get-default")  { return ndnsec_get_default(argc - 1, argv + 1); }
+      else if (command == "set-default")  { return ndnsec_set_default(argc - 1, argv + 1); }
+      else if (command == "key-gen")      { return ndnsec_key_gen(argc - 1, argv + 1); }
+      else if (command == "dsk-gen")      { return ndnsec_dsk_gen(argc - 1, argv + 1); }
+      else if (command == "sign-req")     { return ndnsec_sign_req(argc - 1, argv + 1); }
+      else if (command == "cert-gen")     { return ndnsec_cert_gen(argc - 1, argv + 1); }
+      else if (command == "cert-revoke")  { return ndnsec_cert_revoke(argc - 1, argv + 1); }
+      else if (command == "cert-dump")    { return ndnsec_cert_dump(argc - 1, argv + 1); }
+      else if (command == "cert-install") { return ndnsec_cert_install(argc - 1, argv + 1); }
+      else if (command == "delete")       { return ndnsec_delete(argc - 1, argv + 1); }
+      else if (command == "export")       { return ndnsec_export(argc - 1, argv + 1); }
+      else if (command == "import")       { return ndnsec_import(argc - 1, argv + 1); }
+      else if (command == "sig-verify")   { return ndnsec_sig_verify(argc - 1, argv + 1); }
+      else if (command == "set-acl")      { return ndnsec_set_acl(argc - 1, argv + 1); }
+      else if (command == "unlock-tpm")   { return ndnsec_unlock_tpm(argc - 1, argv + 1); }
+      else if (command == "op-tool")      { return ndnsec_op_tool(argc - 1, argv + 1); }
+      else {
+        std::cerr << ndnsec_helper << std::endl;
+        return 1;
+      }
+    }
+  catch (const std::runtime_error& e)
+    {
+      std::cerr << "ERROR: " << e.what() << std::endl;
+      return 1;
+    }
+
+  return 0;
+}