diff --git a/tools/pib/key-cache.hpp b/tools/pib/key-cache.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 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_PIB_KEY_CACHE_HPP
+#define NDN_PIB_KEY_CACHE_HPP
+
+#include <ndn-cxx/name.hpp>
+#include <ndn-cxx/util/time.hpp>
+#include <ndn-cxx/security/public-key.hpp>
+
+#include <stack>
+
+#include <boost/multi_index_container.hpp>
+#include <boost/multi_index/member.hpp>
+#include <boost/multi_index/hashed_index.hpp>
+#include <boost/multi_index/sequenced_index.hpp>
+#include <boost/multi_index/key_extractors.hpp>
+
+namespace ndn {
+namespace pib {
+
+struct KeyCacheEntry
+{
+  KeyCacheEntry(const Name& name, shared_ptr<PublicKey> key);
+
+  Name name;
+  shared_ptr<PublicKey> key;
+};
+
+class byName;
+class byUsedTime;
+
+typedef boost::multi_index::multi_index_container<
+  KeyCacheEntry,
+  boost::multi_index::indexed_by<
+    boost::multi_index::hashed_unique<
+      boost::multi_index::tag<byName>,
+      boost::multi_index::member<KeyCacheEntry, Name, &KeyCacheEntry::name>,
+      std::hash<Name>
+    >,
+
+    boost::multi_index::sequenced<
+      boost::multi_index::tag<byUsedTime>
+    >
+  >
+> KeyContainer;
+
+class KeyCache : noncopyable
+{
+public:
+  explicit
+  KeyCache(size_t capacity = getDefaultCapacity());
+
+  void
+  insert(const Name& name, shared_ptr<PublicKey> key);
+
+  shared_ptr<PublicKey>
+  find(const Name& name) const;
+
+  void
+  erase(const Name& name);
+
+  size_t
+  size() const;
+
+private:
+  static size_t
+  getDefaultCapacity()
+  {
+    return 100;
+  }
+
+  void
+  evictKey();
+
+  void
+  adjustLru(KeyContainer::iterator it) const;
+
+  void
+  freeEntry(KeyContainer::iterator it);
+
+private:
+  size_t m_capacity;
+  mutable KeyContainer m_keys;
+};
+
+} // namespace pib
+} // namespace ndn
+
+#endif // NDN_PIB_KEY_CACHE_HPP