diff --git a/src/security/key-container.cpp b/src/security/key-container.cpp
new file mode 100644
index 0000000..51ffac5
--- /dev/null
+++ b/src/security/key-container.cpp
@@ -0,0 +1,108 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2013-2015 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.
+ */
+
+#include "key-container.hpp"
+#include "pib-impl.hpp"
+
+namespace ndn {
+namespace security {
+
+KeyContainer::const_iterator::const_iterator(const Name& identity,
+                                             std::set<name::Component>::const_iterator it,
+                                             shared_ptr<PibImpl> impl)
+  : m_identity(identity)
+  , m_it(it)
+  , m_impl(impl)
+{
+}
+
+Key
+KeyContainer::const_iterator::operator*()
+{
+  return Key(m_identity, *m_it, m_impl);
+}
+
+KeyContainer::const_iterator&
+KeyContainer::const_iterator::operator++()
+{
+  ++m_it;
+  return *this;
+}
+
+KeyContainer::const_iterator
+KeyContainer::const_iterator::operator++(int)
+{
+  const_iterator it(*this);
+  ++m_it;
+  return it;
+}
+
+bool
+KeyContainer::const_iterator::operator==(const const_iterator& other)
+{
+  return (m_impl == other.m_impl && m_identity == other.m_identity && m_it == other.m_it);
+}
+
+bool
+KeyContainer::const_iterator::operator!=(const const_iterator& other)
+{
+  return !(*this == other);
+}
+
+KeyContainer::KeyContainer()
+{
+}
+
+KeyContainer::KeyContainer(const Name& identity,
+                           std::set<name::Component>&& keyIds,
+                           shared_ptr<PibImpl> impl)
+  : m_identity(identity)
+  , m_keyIds(keyIds)
+  , m_impl(impl)
+{
+}
+
+KeyContainer::const_iterator
+KeyContainer::begin() const
+{
+  return const_iterator(m_identity, m_keyIds.begin(), m_impl);
+}
+
+KeyContainer::const_iterator
+KeyContainer::end() const
+{
+  return const_iterator(m_identity, m_keyIds.end(), m_impl);
+}
+
+KeyContainer::const_iterator
+KeyContainer::find(const name::Component& keyId) const
+{
+  return const_iterator(m_identity, m_keyIds.find(keyId), m_impl);
+}
+
+size_t
+KeyContainer::size() const
+{
+  return m_keyIds.size();
+}
+
+} // namespace security
+} // namespace ndn