diff --git a/src/security/v2/certificate-fetcher-from-network.hpp b/src/security/v2/certificate-fetcher-from-network.hpp
new file mode 100644
index 0000000..e5076c3
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+++ b/src/security/v2/certificate-fetcher-from-network.hpp
@@ -0,0 +1,88 @@
+/* -*- 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.
+ */
+
+#ifndef NDN_SECURITY_V2_CERTIFICATE_FETCHER_FROM_NETWORK_HPP
+#define NDN_SECURITY_V2_CERTIFICATE_FETCHER_FROM_NETWORK_HPP
+
+#include "certificate-fetcher.hpp"
+
+namespace ndn {
+
+namespace lp {
+class Nack;
+} // namespace lp
+
+namespace security {
+namespace v2 {
+
+/**
+ * @brief Fetch missing keys from the network
+ */
+class CertificateFetcherFromNetwork : public CertificateFetcher
+{
+public:
+  explicit
+  CertificateFetcherFromNetwork(Face& face);
+
+protected:
+  void
+  doFetch(const shared_ptr<CertificateRequest>& certRequest, const shared_ptr<ValidationState>& state,
+          const ValidationContinuation& continueValidation) override;
+
+private:
+  /**
+   * @brief Callback invoked when certificate is retrieved.
+   */
+  void
+  dataCallback(const Data& data,
+               const shared_ptr<CertificateRequest>& certRequest, const shared_ptr<ValidationState>& state,
+               const ValidationContinuation& continueValidation);
+
+  /**
+   * @brief Callback invoked when interest for fetching certificate gets NACKed.
+   *
+   * It will retry if certRequest->m_nRetriesLeft > 0
+   *
+   * @todo Delay retry for some amount of time
+   */
+  void
+  nackCallback(const lp::Nack& nack,
+               const shared_ptr<CertificateRequest>& certRequest, const shared_ptr<ValidationState>& state,
+               const ValidationContinuation& continueValidation);
+
+  /**
+   * @brief Callback invoked when interest for fetching certificate times out.
+   *
+   * It will retry if certRequest->m_nRetriesLeft > 0
+   */
+  void
+  timeoutCallback(const shared_ptr<CertificateRequest>& certRequest, const shared_ptr<ValidationState>& state,
+                  const ValidationContinuation& continueValidation);
+
+protected:
+  Face& m_face;
+};
+
+} // namespace v2
+} // namespace security
+} // namespace ndn
+
+#endif // NDN_SECURITY_V2_CERTIFICATE_FETCHER_FROM_NETWORK_HPP