diff --git a/src/security/tpm/back-end.cpp b/src/security/tpm/back-end.cpp
new file mode 100644
index 0000000..18df659
--- /dev/null
+++ b/src/security/tpm/back-end.cpp
@@ -0,0 +1,138 @@
+/* -*- 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.
+ */
+
+#include "back-end.hpp"
+#include "key-handle.hpp"
+#include "tpm.hpp"
+#include "../transform.hpp"
+#include "../../encoding/buffer-stream.hpp"
+#include "../../util/random.hpp"
+#include "../pib/key.hpp"
+
+namespace ndn {
+namespace security {
+namespace tpm {
+
+BackEnd::~BackEnd() = default;
+
+bool
+BackEnd::hasKey(const Name& keyName) const
+{
+  return doHasKey(keyName);
+}
+
+unique_ptr<KeyHandle>
+BackEnd::getKeyHandle(const Name& keyName) const
+{
+  return doGetKeyHandle(keyName);
+}
+
+unique_ptr<KeyHandle>
+BackEnd::createKey(const Name& identity, const KeyParams& params)
+{
+  // key name checking
+  switch (params.getKeyIdType()) {
+    case KeyIdType::USER_SPECIFIED: { // keyId is pre-set.
+      Name keyName = v2::constructKeyName(identity, params.getKeyId());
+      if (hasKey(keyName)) {
+        BOOST_THROW_EXCEPTION(Tpm::Error("Key `" + keyName.toUri() + "` already exists"));
+      }
+      break;
+    }
+    case KeyIdType::SHA256: {
+      // KeyName will be assigned in setKeyName after key is generated
+      break;
+    }
+    case KeyIdType::RANDOM: {
+      Name keyName;
+      name::Component keyId;
+      do {
+        keyId = name::Component::fromNumber(random::generateSecureWord64());
+        keyName = v2::constructKeyName(identity, params.getKeyId());
+      } while (hasKey(keyName));
+
+      const_cast<KeyParams&>(params).setKeyId(keyId);
+      break;
+    }
+    default: {
+      BOOST_THROW_EXCEPTION(Error("Unsupported key id type"));
+    }
+  }
+
+  return doCreateKey(identity, params);
+}
+
+void
+BackEnd::deleteKey(const Name& keyName)
+{
+  doDeleteKey(keyName);
+}
+
+ConstBufferPtr
+BackEnd::exportKey(const Name& keyName, const char* pw, size_t pwLen)
+{
+  if (!hasKey(keyName)) {
+    BOOST_THROW_EXCEPTION(Error("Key `" + keyName.toUri() + "` does not exist"));
+  }
+  return doExportKey(keyName, pw, pwLen);
+}
+
+void
+BackEnd::importKey(const Name& keyName, const uint8_t* pkcs8, size_t pkcs8Len, const char* pw, size_t pwLen)
+{
+  if (hasKey(keyName)) {
+    BOOST_THROW_EXCEPTION(Error("Key `" + keyName.toUri() + "` already exists"));
+  }
+  doImportKey(keyName, pkcs8, pkcs8Len, pw, pwLen);
+}
+
+void
+BackEnd::setKeyName(KeyHandle& keyHandle, const Name& identity, const KeyParams& params)
+{
+  name::Component keyId;
+  switch (params.getKeyIdType()) {
+    case KeyIdType::USER_SPECIFIED:
+      keyId = params.getKeyId();
+      break;
+    case KeyIdType::SHA256: {
+      using namespace transform;
+
+      OBufferStream os;
+      bufferSource(*keyHandle.derivePublicKey()) >> digestFilter() >> streamSink(os);
+      keyId = name::Component(os.buf());
+      break;
+    }
+    case KeyIdType::RANDOM: {
+      BOOST_ASSERT(!params.getKeyId().empty());
+      keyId = params.getKeyId();
+      break;
+    }
+    default: {
+      BOOST_ASSERT(false);
+    }
+  }
+
+  keyHandle.setKeyName(v2::constructKeyName(identity, keyId));
+}
+
+} // namespace tpm
+} // namespace security
+} // namespace ndn