diff --git a/src/security/tpm/key-handle.hpp b/src/security/tpm/key-handle.hpp
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+++ b/src/security/tpm/key-handle.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_TPM_KEY_HANDLE_HPP
+#define NDN_SECURITY_TPM_KEY_HANDLE_HPP
+
+#include "../../common.hpp"
+#include "../../name.hpp"
+#include "../security-common.hpp"
+
+namespace ndn {
+namespace security {
+namespace tpm {
+
+/**
+ * @brief Abstraction of TPM key handle.
+ *
+ * Handle provides an interface to perform crypto operations with a key in TPM.
+ */
+class KeyHandle : noncopyable
+{
+public:
+  class Error : public std::runtime_error
+  {
+  public:
+    explicit
+    Error(const std::string& what)
+      : std::runtime_error(what)
+    {
+    }
+  };
+
+public:
+  virtual
+  ~KeyHandle();
+
+  /**
+   * @return a digital signature created on @p buf using this key with @p digestAlgorithm.
+   */
+  ConstBufferPtr
+  sign(DigestAlgorithm digestAlgorithm, const uint8_t* buf, size_t size) const;
+
+  /**
+   * @return plain text content decrypted from @p cipherText using this key.
+   */
+  ConstBufferPtr
+  decrypt(const uint8_t* cipherText, size_t cipherTextLen) const;
+
+  /**
+   * @return the PCKS#8 encoded public key bits derived from this key.
+   */
+  ConstBufferPtr
+  derivePublicKey() const;
+
+  void
+  setKeyName(const Name& keyName);
+
+  Name
+  getKeyName() const;
+
+private:
+  virtual ConstBufferPtr
+  doSign(DigestAlgorithm digestAlgorithm, const uint8_t* buf, size_t size) const = 0;
+
+  virtual ConstBufferPtr
+  doDecrypt(const uint8_t* cipherText, size_t cipherTextLen) const = 0;
+
+  virtual ConstBufferPtr
+  doDerivePublicKey() const = 0;
+
+private:
+  Name m_keyName;
+};
+
+} // namespace tpm
+} // namespace security
+} // namespace ndn
+
+#endif // NDN_SECURITY_TPM_KEY_HANDLE_HPP