diff --git a/ndnx/ndnx-verifier.h b/ndnx/ndnx-verifier.h
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+/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2013 University of California, Los Angeles
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation;
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Author: Zhenkai Zhu <zhenkai@cs.ucla.edu>
+ *         Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+ */
+
+#ifndef NDNX_VERIFIER_H
+#define NDNX_VERIFIER_H
+
+#include "ndnx-common.h"
+#include "ndnx-name.h"
+#include "ndnx-cert.h"
+#include "ndnx-pco.h"
+#include <map>
+#include <boost/thread/locks.hpp>
+#include <boost/thread/recursive_mutex.hpp>
+#include <boost/thread/thread.hpp>
+
+namespace Ndnx {
+
+class NdnxWrapper;
+
+class Verifier
+{
+public:
+  Verifier(NdnxWrapper *ndnx);
+  ~Verifier();
+
+  bool verify(const PcoPtr &pco, double maxWait);
+
+private:
+
+private:
+  NdnxWrapper *m_ndnx;
+  Hash m_rootKeyDigest;
+  typedef std::map<Hash, CertPtr> CertCache;
+  CertCache m_certCache;
+  typedef boost::recursive_mutex RecLock;
+  typedef boost::unique_lock<RecLock> UniqueRecLock;
+  RecLock m_cacheLock;
+};
+
+} // Ndnx
+
+#endif // NDNX_VERIFIER_H