diff --git a/src/security/in-memory-pib-impl.hpp b/src/security/in-memory-pib-impl.hpp
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+++ b/src/security/in-memory-pib-impl.hpp
@@ -0,0 +1,153 @@
+/* -*- 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.
+ */
+
+#ifndef NDN_SECURITY_IN_MEMORY_PIB_IMPL_HPP
+#define NDN_SECURITY_IN_MEMORY_PIB_IMPL_HPP
+
+#include "pib-impl.hpp"
+
+namespace ndn {
+namespace security {
+
+/**
+ * @brief An in-memory implementation of Pib
+ *
+ * All the contents in Pib are stored in memory
+ * and have the same lifetime as the implementation instance.
+ */
+class InMemoryPibImpl : public PibImpl
+{
+public:
+  class Error : public PibImpl::Error
+  {
+  public:
+    explicit
+    Error(const std::string& what)
+      : PibImpl::Error(what)
+    {
+    }
+  };
+
+public:
+  InMemoryPibImpl();
+
+public: // TpmLocator management
+
+  virtual void
+  setTpmLocator(const std::string& tpmLocator) NDN_CXX_DECL_OVERRIDE;
+
+  virtual std::string
+  getTpmLocator() const NDN_CXX_DECL_OVERRIDE;
+
+public: // Identity management
+
+  virtual bool
+  hasIdentity(const Name& identity) const NDN_CXX_DECL_OVERRIDE;
+
+  virtual void
+  addIdentity(const Name& identity) NDN_CXX_DECL_OVERRIDE;
+
+  virtual void
+  removeIdentity(const Name& identity) NDN_CXX_DECL_OVERRIDE;
+
+  virtual std::set<Name>
+  getIdentities() const NDN_CXX_DECL_OVERRIDE;
+
+  virtual void
+  setDefaultIdentity(const Name& identityName) NDN_CXX_DECL_OVERRIDE;
+
+  virtual Name
+  getDefaultIdentity() const NDN_CXX_DECL_OVERRIDE;
+
+public: // Key management
+
+  virtual bool
+  hasKey(const Name& identity, const name::Component& keyId) const NDN_CXX_DECL_OVERRIDE;
+
+  virtual void
+  addKey(const Name& identity, const name::Component& keyId, const PublicKey& publicKey) NDN_CXX_DECL_OVERRIDE;
+
+  virtual void
+  removeKey(const Name& identity, const name::Component& keyId) NDN_CXX_DECL_OVERRIDE;
+
+  virtual PublicKey
+  getKeyBits(const Name& identity, const name::Component& keyId) const NDN_CXX_DECL_OVERRIDE;
+
+  virtual std::set<name::Component>
+  getKeysOfIdentity(const Name& identity) const NDN_CXX_DECL_OVERRIDE;
+
+  virtual void
+  setDefaultKeyOfIdentity(const Name& identity, const name::Component& keyId) NDN_CXX_DECL_OVERRIDE;
+
+  virtual name::Component
+  getDefaultKeyOfIdentity(const Name& identity) const NDN_CXX_DECL_OVERRIDE;
+
+public: // Certificate management
+
+  virtual bool
+  hasCertificate(const Name& certName) const NDN_CXX_DECL_OVERRIDE;
+
+  virtual void
+  addCertificate(const IdentityCertificate& certificate) NDN_CXX_DECL_OVERRIDE;
+
+  virtual void
+  removeCertificate(const Name& certName) NDN_CXX_DECL_OVERRIDE;
+
+  virtual IdentityCertificate
+  getCertificate(const Name& certName) const NDN_CXX_DECL_OVERRIDE;
+
+  virtual std::set<Name>
+  getCertificatesOfKey(const Name& identity, const name::Component& keyId) const NDN_CXX_DECL_OVERRIDE;
+
+  virtual void
+  setDefaultCertificateOfKey(const Name& identity, const name::Component& keyId, const Name& certName) NDN_CXX_DECL_OVERRIDE;
+
+  virtual IdentityCertificate
+  getDefaultCertificateOfKey(const Name& identity, const name::Component& keyId) const NDN_CXX_DECL_OVERRIDE;
+
+private: // Key management
+
+  Name
+  getKeyName(const Name& identity, const name::Component& keyId) const;
+
+private:
+
+  std::set<Name> m_identities;
+  bool m_hasDefaultIdentity;
+  Name m_defaultIdentity;
+
+  /// @brief keyName => keyBits
+  std::map<Name, PublicKey> m_keys;
+
+  /// @brief identity => default key Name
+  std::map<Name, Name> m_defaultKey;
+
+  /// @brief certificate Name => certificate
+  std::map<Name, IdentityCertificate> m_certs;
+
+  /// @brief keyName => default certificate Name
+  std::map<Name, Name> m_defaultCert;
+};
+
+} // namespace security
+} // namespace ndn
+
+#endif // NDN_SECURITY_SEC_PIB_MEMORY_IMPL_HPP