diff --git a/tools/ndnsec/cert-install.hpp b/tools/ndnsec/cert-install.hpp
new file mode 100644
index 0000000..94a73a7
--- /dev/null
+++ b/tools/ndnsec/cert-install.hpp
@@ -0,0 +1,235 @@
+/* -*- 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/>
+ */
+
+#ifndef NDN_TOOLS_NDNSEC_CERT_INSTALL_HPP
+#define NDN_TOOLS_NDNSEC_CERT_INSTALL_HPP
+
+#include "util.hpp"
+
+
+class HttpException : public std::runtime_error
+{
+public:
+  explicit
+  HttpException(const std::string& what)
+    : std::runtime_error(what)
+  {
+  }
+};
+
+ndn::shared_ptr<ndn::IdentityCertificate>
+getCertificateHttp(const std::string& host, const std::string& port, const std::string& path)
+{
+  using namespace boost::asio::ip;
+  tcp::iostream requestStream;
+
+  requestStream.expires_from_now(boost::posix_time::milliseconds(3000));
+
+  requestStream.connect(host, port);
+  if (!static_cast<bool>(requestStream))
+    {
+      throw HttpException("HTTP connection error");
+    }
+  requestStream << "GET " << path << " HTTP/1.0\r\n";
+  requestStream << "Host: " << host << "\r\n";
+  requestStream << "Accept: */*\r\n";
+  requestStream << "Cache-Control: no-cache\r\n";
+  requestStream << "Connection: close\r\n\r\n";
+  requestStream.flush();
+
+  std::string statusLine;
+  std::getline(requestStream, statusLine);
+  if (!static_cast<bool>(requestStream))
+    {
+      throw HttpException("HTTP communication error");
+    }
+
+  std::stringstream responseStream(statusLine);
+  std::string httpVersion;
+  responseStream >> httpVersion;
+  unsigned int statusCode;
+  responseStream >> statusCode;
+  std::string statusMessage;
+
+  std::getline(responseStream, statusMessage);
+  if (!static_cast<bool>(requestStream) || httpVersion.substr(0, 5) != "HTTP/")
+    {
+      throw HttpException("HTTP communication error");
+    }
+  if (statusCode != 200)
+    {
+      throw HttpException("HTTP server error");
+    }
+  std::string header;
+  while (std::getline(requestStream, header) && header != "\r")
+    ;
+
+  ndn::OBufferStream os;
+  {
+    using namespace CryptoPP;
+    FileSource ss2(requestStream, true, new Base64Decoder(new FileSink(os)));
+  }
+
+  ndn::shared_ptr<ndn::IdentityCertificate> identityCertificate =
+    ndn::make_shared<ndn::IdentityCertificate>();
+  identityCertificate->wireDecode(ndn::Block(os.buf()));
+
+  return identityCertificate;
+}
+
+int
+ndnsec_cert_install(int argc, char** argv)
+{
+  using namespace ndn;
+  namespace po = boost::program_options;
+
+  std::string certFileName;
+  bool isSystemDefault = true;
+  bool isIdentityDefault = false;
+  bool isKeyDefault = false;
+
+  po::options_description description("General Usage\n  ndnsec cert-install [-h] [-I|K|N] cert-file\nGeneral options");
+  description.add_options()
+    ("help,h", "produce help message")
+    ("cert-file,f", po::value<std::string>(&certFileName), "file name of the ceritificate, - for stdin. "
+                                                      "If starts with http://, will try to fetch "
+                                                      "the certificate using HTTP GET request")
+    ("identity-default,I", "optional, if specified, the certificate will be set as the default certificate of the identity")
+    ("key-default,K", "optional, if specified, the certificate will be set as the default certificate of the key")
+    ("no-default,N", "optional, if specified, the certificate will be simply installed")
+    ;
+  po::positional_options_description p;
+  p.add("cert-file", 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;
+      return 1;
+    }
+
+  if (vm.count("help") != 0)
+    {
+      std::cerr << description << std::endl;
+      return 0;
+    }
+
+  if (vm.count("cert-file") == 0)
+    {
+      std::cerr << "cert_file must be specified" << std::endl;
+      std::cerr << description << std::endl;
+      return 1;
+    }
+
+  if (vm.count("identity-default") != 0)
+    {
+      isIdentityDefault = true;
+      isSystemDefault = false;
+    }
+  else if (vm.count("key-default") != 0)
+    {
+      isKeyDefault = true;
+      isSystemDefault = false;
+    }
+  else if (vm.count("no-default") != 0)
+    {
+      // noDefault = true;
+      isSystemDefault = false;
+    }
+
+  shared_ptr<IdentityCertificate> cert;
+
+  if (certFileName.find("http://") == 0)
+    {
+      std::string host;
+      std::string port;
+      std::string path;
+
+      size_t pos = 7; // offset of "http://"
+      size_t posSlash = certFileName.find("/", pos);
+
+      if (posSlash == std::string::npos)
+        throw HttpException("Request line is not correctly formatted");
+
+      size_t posPort = certFileName.find(":", pos);
+
+      if (posPort != std::string::npos && posPort < posSlash) // port is specified
+        {
+          port = certFileName.substr(posPort + 1, posSlash - posPort - 1);
+          host = certFileName.substr(pos, posPort - pos);
+        }
+      else
+        {
+          port = "80";
+          host = certFileName.substr(pos, posSlash - pos);
+        }
+
+      path = certFileName.substr(posSlash, certFileName.size () - posSlash);
+
+      cert = getCertificateHttp(host, port, path);
+    }
+  else
+    {
+      cert = getIdentityCertificate(certFileName);
+    }
+
+  if (!static_cast<bool>(cert))
+    return 1;
+
+  KeyChain keyChain;
+
+  if (isSystemDefault)
+    {
+      keyChain.addCertificateAsIdentityDefault(*cert);
+      Name keyName = cert->getPublicKeyName();
+      Name identity = keyName.getSubName(0, keyName.size()-1);
+      keyChain.setDefaultIdentity(identity);
+    }
+  else if (isIdentityDefault)
+    {
+      keyChain.addCertificateAsIdentityDefault(*cert);
+    }
+  else if (isKeyDefault)
+    {
+      keyChain.addCertificateAsKeyDefault(*cert);
+    }
+  else
+    {
+      keyChain.addCertificate(*cert);
+    }
+
+  std::cerr << "OK: certificate with name ["
+            << cert->getName().toUri()
+            << "] has been successfully installed"
+            << std::endl;
+
+  return 0;
+}
+
+#endif // NDN_TOOLS_NDNSEC_CERT_INSTALL_HPP