diff --git a/src/validator.hpp b/src/validator.hpp
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+++ b/src/validator.hpp
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+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2014  The University of Memphis,
+ *                     Regents of the University of California
+ *
+ * This file is part of NLSR (Named-data Link State Routing).
+ * See AUTHORS.md for complete list of NLSR authors and contributors.
+ *
+ * NLSR is free software: you can redistribute it and/or modify it under the terms
+ * of the GNU General Public License as published by the Free Software Foundation,
+ * either version 3 of the License, or (at your option) any later version.
+ *
+ * NLSR 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * NLSR, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @author Yingdi Yu <yingdi@cs.ucla.edu>
+ **/
+
+#ifndef NLSR_VALIDATOR_HPP
+#define NLSR_VALIDATOR_HPP
+
+#include <ndn-cxx/security/validator-config.hpp>
+
+namespace nlsr {
+
+class Validator : public ndn::ValidatorConfig
+{
+public:
+  class Error : public ndn::ValidatorConfig::Error
+  {
+  public:
+    explicit
+    Error(const std::string& what)
+      : ndn::ValidatorConfig::Error(what)
+    {
+    }
+  };
+
+  explicit
+  Validator(ndn::Face& face,
+            const ndn::Name broadcastPrefix,
+            const ndn::shared_ptr<ndn::CertificateCache>& cache,
+            const int stepLimit = 10)
+    : ndn::ValidatorConfig(face, cache, stepLimit)
+    , m_broadcastPrefix(broadcastPrefix)
+  {
+    m_broadcastPrefix.append("KEYS");
+  }
+
+  virtual
+  ~Validator()
+  {
+  }
+
+  const ndn::Name&
+  getBroadcastPrefix()
+  {
+    return m_broadcastPrefix;
+  }
+
+  void
+  setBroadcastPrefix(const ndn::Name& broadcastPrefix)
+  {
+    m_broadcastPrefix = broadcastPrefix;
+  }
+
+protected:
+  typedef std::vector<ndn::shared_ptr<ndn::ValidationRequest> > NextSteps;
+
+  virtual void
+  checkPolicy(const ndn::Data& data,
+              int nSteps,
+              const ndn::OnDataValidated& onValidated,
+              const ndn::OnDataValidationFailed& onValidationFailed,
+              NextSteps& nextSteps)
+  {
+    ndn::ValidatorConfig::checkPolicy(data, nSteps,
+                                      onValidated, onValidationFailed,
+                                      nextSteps);
+
+    for (NextSteps::iterator it = nextSteps.begin(); it != nextSteps.end(); it++)
+      {
+        ndn::Name broadcastName = m_broadcastPrefix;
+        broadcastName.append((*it)->m_interest.getName());
+
+        (*it)->m_interest.setName(broadcastName);
+      }
+  }
+
+  virtual void
+  checkPolicy(const ndn::Interest& interest,
+              int nSteps,
+              const ndn::OnInterestValidated& onValidated,
+              const ndn::OnInterestValidationFailed& onValidationFailed,
+              NextSteps& nextSteps)
+  {
+    ndn::ValidatorConfig::checkPolicy(interest, nSteps,
+                                      onValidated, onValidationFailed,
+                                      nextSteps);
+
+    for (NextSteps::iterator it = nextSteps.begin(); it != nextSteps.end(); it++)
+      {
+        ndn::Name broadcastName = m_broadcastPrefix;
+        broadcastName.append((*it)->m_interest.getName());
+
+        (*it)->m_interest.setName(broadcastName);
+      }
+
+  }
+
+  void
+  onData(const ndn::Interest& interest,
+         const ndn::Data& data,
+         const ndn::shared_ptr<ndn::ValidationRequest>& nextStep)
+  {
+
+    ndn::shared_ptr<ndn::Data> internalData = ndn::make_shared<ndn::Data>();
+    internalData->wireDecode(data.getContent().blockFromValue());
+    validate(*internalData,
+             nextStep->m_onValidated, nextStep->m_onDataValidated, nextStep->m_nSteps);
+  }
+
+private:
+  ndn::Name m_broadcastPrefix;
+};
+
+
+} // namespace nlsr
+
+#endif // NLSR_VALIDATOR_HPP