diff --git a/src/security/pib/pib.hpp b/src/security/pib/pib.hpp
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+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2013-2016 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_PIB_PIB_HPP
+#define NDN_SECURITY_PIB_PIB_HPP
+
+#include "identity-container.hpp"
+
+namespace ndn {
+namespace security {
+
+class KeyChain;
+class PibImpl;
+
+/**
+ * @brief represents the PIB
+ *
+ * The PIB (Public Information Base) stores the public portion of a user's cryptography keys.
+ * The format and location of stored information is indicated by the PibLocator.
+ * The PIB is designed to work with a TPM (Trusted Platform Module) which stores private keys.
+ * There is a one-to-one association between PIB and TPM, and therefore the TpmLocator is recorded
+ * by the PIB to enforce this association and prevent one from operating on mismatched PIB and TPM.
+ *
+ * Information in the PIB is organized in a hierarchy of Identity-Key-Certificate. At the top level,
+ * the Pib class provides access to identities, and allows setting a default identity. Properties of
+ * an identity can be accessed after obtaining an Identity object.
+ *
+ * @throw PibImpl::Error when underlying implementation has non-semantic error.
+ */
+class Pib : noncopyable
+{
+public:
+  friend class KeyChain;
+
+public:
+  /// @brief represents a semantic error
+  class Error : public std::runtime_error
+  {
+  public:
+    explicit
+    Error(const std::string& what)
+      : std::runtime_error(what)
+    {
+    }
+  };
+
+public:
+
+  ~Pib();
+
+  /**
+   * @brief return the scheme of the PibLocator
+   */
+  std::string
+  getScheme() const
+  {
+    return m_scheme;
+  }
+
+  /**
+   * @brief Get PIB Locator
+   */
+  std::string
+  getPibLocator() const;
+
+  /**
+   * @brief Set the corresponding TPM information to @p tpmLocator.
+   *
+   * If the provided @p tpmLocator is different from the existing one, the
+   * PIB will be reset, otherwise nothing will be changed.
+   *
+   * @param tpmLocator The name for the new TPM locator
+   */
+  void
+  setTpmLocator(const std::string& tpmLocator);
+
+  /**
+   * @brief Get TPM Locator
+   */
+  std::string
+  getTpmLocator() const;
+
+  /**
+   * @brief Get an identity with name @p identityName.
+   *
+   * @param identityName The name for the identity to get.
+   * @throw Pib::Error if the identity does not exist.
+   */
+  Identity
+  getIdentity(const Name& identityName) const;
+
+  /// @brief Get all the identities
+  const IdentityContainer&
+  getIdentities() const;
+
+  /**
+   * @brief Get the default identity.
+   *
+   * @return the default identity.
+   * @throws Pib::Error if no default identity.
+   */
+  Identity&
+  getDefaultIdentity() const;
+
+NDN_CXX_PUBLIC_WITH_TESTS_ELSE_PRIVATE: // write operations should be private
+
+  /*
+   * @brief Create an identity with name @p identityName and return a reference to it.
+   *
+   * If there already exists an identity for the name @p identityName, then it is returned.
+   * If no default identity is set, the newly created identity will be set as the default.
+   *
+   * @param identityName The name for the identity to be added
+   */
+  Identity
+  addIdentity(const Name& identityName);
+
+  /*
+   * @brief Remove an identity with name @p identityName.
+   *
+   * @param identityName The name for the identity to be deleted
+   */
+  void
+  removeIdentity(const Name& identityName);
+
+  /**
+   * @brief Set an identity with name @p identityName as the default identity.
+   *
+   * Also create the identity if it does not exist.
+   *
+   * @param identityName The name for the default identity.
+   * @return the default identity
+   */
+  Identity&
+  setDefaultIdentity(const Name& identityName);
+
+NDN_CXX_PUBLIC_WITH_TESTS_ELSE_PRIVATE:
+  /*
+   * @brief Create a new Pib with the specified @p location
+   *
+   * @param scheme The scheme for the Pib
+   * @param location The location for the Pib
+   * @param impl The backend implementation
+   */
+  Pib(const std::string scheme, const std::string& location, shared_ptr<PibImpl> impl);
+
+  shared_ptr<PibImpl>
+  getImpl()
+  {
+    return m_impl;
+  }
+
+protected:
+  std::string m_scheme;
+  std::string m_location;
+
+  mutable bool m_hasDefaultIdentity;
+  mutable Identity m_defaultIdentity;
+
+  mutable bool m_needRefreshIdentities;
+  mutable IdentityContainer m_identities;
+
+  shared_ptr<PibImpl> m_impl;
+};
+
+} // namespace security
+} // namespace ndn
+
+#endif // NDN_SECURITY_PIB_PIB_HPP