diff --git a/tools/ndnsec.cpp b/tools/ndnsec.cpp
new file mode 100644
index 0000000..eb0877a
--- /dev/null
+++ b/tools/ndnsec.cpp
@@ -0,0 +1,73 @@
+/* -*- 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>
+ */
+
+#include "ndnsec-util.hpp"
+#include "ndnsec-list.hpp"
+#include "ndnsec-get-default.hpp"
+#include "ndnsec-set-default.hpp"
+#include "ndnsec-key-gen.hpp"
+#include "ndnsec-dsk-gen.hpp"
+#include "ndnsec-sign-req.hpp"
+#include "ndnsec-cert-gen.hpp"
+#include "ndnsec-cert-dump.hpp"
+#include "ndnsec-cert-install.hpp"
+#include "ndnsec-export.hpp"
+#include "ndnsec-import.hpp"
+#include "ndnsec-delete.hpp"
+#include "ndnsec-sig-verify.hpp"
+#include "ndnsec-set-acl.hpp"
+#include "ndnsec-unlock-tpm.hpp"
+#include "ndnsec-op-tool.hpp"
+
+using namespace ndn;
+
+std::string ndnsec_helper("\
+  help         Show all commands.\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-dump    Dump a certificate from PublicInfo.\n\
+  cert-install Install a certificate into PublicInfo.\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)
+{
+  std::string command(argv[1]);
+  
+  if(command == "help") { std::cerr << ndnsec_helper << 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-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 == "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;
+  }
+
+  return 0;
+}