diff --git a/src/key-viewer-dialog.hpp b/src/key-viewer-dialog.hpp
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+++ b/src/key-viewer-dialog.hpp
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+/* -*- 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 NFD Control Center.  See AUTHORS.md for complete list of NFD
+ * authors and contributors.
+ *
+ * NFD Control Center 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.
+ *
+ * NFD Control Center 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 NFD
+ * Control Center, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef NDN_NCC_KEY_VIEWER_DIALOG_HPP
+#define NDN_NCC_KEY_VIEWER_DIALOG_HPP
+
+#include "key-tree-model.hpp"
+#include <ndn-cxx/security/key-chain.hpp>
+
+#include <QDialog>
+#include <QStandardItemModel>
+
+namespace Ui {
+class KeyViewerDialog;
+}
+
+namespace ndn {
+namespace ncc {
+
+class KeyViewerDialog : public QDialog
+{
+  Q_OBJECT
+
+public:
+  KeyViewerDialog(QWidget *parent = 0);
+
+  virtual
+  ~KeyViewerDialog();
+
+  void
+  updateModel();
+
+private:
+  KeyTreeItem*
+  createIdentityNode(const Name& identity);
+
+  KeyTreeItem*
+  createKeyNode(const Name& keyName, KeyTreeItem* idItem);
+
+signals:
+  void
+  clicked(const QModelIndex &index);
+
+public slots:
+  void
+  present();
+
+private slots:
+  void
+  displayCert(const QModelIndex& index);
+  // void insertChild();
+  // bool insertColumn();
+  // void insertRow();
+  // bool removeColumn();
+  // void removeRow();
+
+private:
+  Ui::KeyViewerDialog* ui;
+
+  shared_ptr<KeyTreeModel> m_model;
+  shared_ptr<KeyChain> m_keyChain;
+
+  shared_ptr<QStandardItemModel> m_tableModel;
+};
+
+} // namespace ncc
+} // namespace ndn
+
+#endif // NDN_NCC_KEY_VIEWER_DIALOG_HPP