diff --git a/tools/ndnsec/cert-dump.cpp b/tools/ndnsec/cert-dump.cpp
new file mode 100644
index 0000000..83c34a3
--- /dev/null
+++ b/tools/ndnsec/cert-dump.cpp
@@ -0,0 +1,183 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2013-2017 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.
+ */
+
+#include "ndnsec.hpp"
+#include "util.hpp"
+
+namespace ndn {
+namespace ndnsec {
+
+int
+ndnsec_cert_dump(int argc, char** argv)
+{
+  namespace po = boost::program_options;
+
+  std::string name;
+  bool isKeyName = false;
+  bool isIdentityName = false;
+  bool isCertName = true;
+  // bool isFileName = false;
+  bool isPretty = false;
+  bool isStdOut = true;
+  bool isRepoOut = false;
+  std::string repoHost;
+  std::string repoPort;
+  // bool isDnsOut = false;
+
+  po::options_description description("General Usage\n"
+                                      "  ndnsec cert-dump [-h] [-p] [-d] [-r [-H repo-host] "
+                                         "[-P repo-port] ] [-i|k|f] name\n"
+                                      "General options");
+  description.add_options()
+    ("help,h",     "produce help message")
+    ("pretty,p",   "display certificate in human readable format")
+    ("identity,i", "treat the name parameter as identity name (e.g., /ndn/edu/ucla/alice")
+    ("key,k",      "treat the name parameter as key name "
+                   "(e.g., /ndn/edu/ucla/alice/ksk-123456789)")
+    ("file,f",     "treat the name parameter as file name with base64 encoded certificate, "
+                   "- for stdin")
+    ("repo-output,r", "publish the certificate to the repo-ng")
+    ("repo-host,H", po::value<std::string>(&repoHost)->default_value("localhost"),
+                   "the repo host if repo-output is specified")
+    ("repo-port,P", po::value<std::string>(&repoPort)->default_value("7376"),
+                   "the repo port if repo-output is specified")
+    // ("dns-output,d", "published the certificate to NDNS")
+    ("name,n", po::value<std::string>(&name),
+                   "unless overridden with --identity or --key parameter, the certificate name, "
+                   "for example, /ndn/edu/ucla/KEY/cs/alice/ksk-1234567890"
+                                "/ID-CERT/%FD%FF%FF%FF%FF%FF%FF%FF")
+    ;
+
+  po::positional_options_description p;
+  p.add("name", 1);
+
+  po::variables_map vm;
+  try {
+    po::store(po::command_line_parser(argc, argv).options(description).positional(p).run(), vm);
+    po::notify(vm);
+  }
+  catch (const std::exception& e) {
+    std::cerr << "ERROR: " << e.what() << std::endl;
+    std::cerr << description << std::endl;
+    return 1;
+  }
+
+  if (vm.count("help") != 0) {
+    std::cerr << description << std::endl;
+    return 0;
+  }
+
+  if (vm.count("name") == 0) {
+    std::cerr << "identity_name must be specified" << std::endl;
+    std::cerr << description << std::endl;
+    return 1;
+  }
+
+  if (vm.count("key") != 0) {
+    isCertName = false;
+    isKeyName = true;
+  }
+  else if (vm.count("identity") != 0) {
+    isCertName = false;
+    isIdentityName = true;
+  }
+  else if (vm.count("file") != 0) {
+    isCertName = false;
+    // isFileName = true;
+  }
+
+  if (vm.count("pretty") != 0)
+    isPretty = true;
+
+  if (vm.count("repo-output") != 0) {
+    isRepoOut = true;
+    isStdOut = false;
+  }
+  else if (vm.count("dns-output") != 0) {
+    // isDnsOut = true;
+    isStdOut = false;
+    std::cerr << "Error: DNS output is not supported yet!" << std::endl;
+    return 1;
+  }
+
+  if (isPretty && !isStdOut) {
+    std::cerr << "Error: pretty option can only be specified when other "
+              << "output option is specified" << std::endl;
+    return 1;
+  }
+
+  shared_ptr<security::v1::IdentityCertificate> certificate;
+
+  security::v1::KeyChain keyChain;
+
+  if (isIdentityName || isKeyName || isCertName) {
+    if (isIdentityName) {
+      Name certName = keyChain.getDefaultCertificateNameForIdentity(name);
+      certificate = keyChain.getCertificate(certName);
+    }
+    else if (isKeyName) {
+      Name certName = keyChain.getDefaultCertificateNameForKey(name);
+      certificate = keyChain.getCertificate(certName);
+    }
+    else
+      certificate = keyChain.getCertificate(name);
+
+    if (certificate == nullptr) {
+      std::cerr << "No certificate found!" << std::endl;
+      return 1;
+    }
+  }
+  else {
+    certificate = getIdentityCertificate(name);
+    if (certificate == nullptr) {
+      std::cerr << "No certificate read!" << std::endl;
+      return 1;
+    }
+  }
+
+  if (isPretty) {
+    std::cout << *certificate << std::endl;
+  }
+  else {
+    if (isStdOut) {
+      io::save(*certificate, std::cout);
+      return 0;
+    }
+    if (isRepoOut) {
+      using namespace boost::asio::ip;
+      tcp::iostream request_stream;
+      request_stream.expires_from_now(boost::posix_time::milliseconds(3000));
+      request_stream.connect(repoHost, repoPort);
+      if (!request_stream) {
+        std::cerr << "fail to open the stream!" << std::endl;
+        return 1;
+      }
+      request_stream.write(reinterpret_cast<const char*>(certificate->wireEncode().wire()),
+                           certificate->wireEncode().size());
+
+      return 0;
+    }
+  }
+  return 0;
+}
+
+} // namespace ndnsec
+} // namespace ndn