diff --git a/src/security/transform/base64-encode.cpp b/src/security/transform/base64-encode.cpp
new file mode 100644
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--- /dev/null
+++ b/src/security/transform/base64-encode.cpp
@@ -0,0 +1,135 @@
+/* -*- 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 "base64-encode.hpp"
+#include "../../encoding/buffer.hpp"
+#include "../detail/openssl.hpp"
+
+namespace ndn {
+namespace security {
+namespace transform {
+
+/**
+ * @brief The implementation class which contains the internal state of the filter
+ *        which includes openssl specific structures.
+ */
+class Base64Encode::Impl
+{
+public:
+  Impl()
+    : m_base64(BIO_new(BIO_f_base64()))
+    , m_sink(BIO_new(BIO_s_mem()))
+  {
+    // connect base64 transform to the data sink.
+    BIO_push(m_base64, m_sink);
+  }
+
+  ~Impl()
+  {
+    BIO_free_all(m_sink);
+  }
+
+public:
+  BIO* m_base64;
+  BIO* m_sink; // BIO_f_base64 alone does not work without a sink
+};
+
+Base64Encode::Base64Encode(bool needBreak)
+  : m_impl(new Impl)
+{
+  if (!needBreak)
+    BIO_set_flags(m_impl->m_base64, BIO_FLAGS_BASE64_NO_NL);
+}
+
+void
+Base64Encode::preTransform()
+{
+  fillOutputBuffer();
+}
+
+size_t
+Base64Encode::convert(const uint8_t* data, size_t dataLen)
+{
+  if (dataLen == 0)
+    return 0;
+
+  int wLen = BIO_write(m_impl->m_base64, data, dataLen);
+
+  if (wLen <= 0) { // fail to write data
+    if (!BIO_should_retry(m_impl->m_base64)) {
+      // we haven't written everything but some error happens, and we cannot retry
+      BOOST_THROW_EXCEPTION(Error(getIndex(), "Failed to accept more input"));
+    }
+    return 0;
+  }
+  else { // update number of bytes written
+    fillOutputBuffer();
+    return wLen;
+  }
+}
+
+void
+Base64Encode::finalize()
+{
+  if (BIO_flush(m_impl->m_base64) != 1)
+    BOOST_THROW_EXCEPTION(Error(getIndex(), "Failed to flush"));
+
+  while (!isConverterEmpty()) {
+    fillOutputBuffer();
+    while (!isOutputBufferEmpty()) {
+      flushOutputBuffer();
+    }
+  }
+}
+
+void
+Base64Encode::fillOutputBuffer()
+{
+  int nRead = BIO_pending(m_impl->m_sink);
+  if (nRead <= 0)
+    return;
+
+  // there is something to read from BIO
+  auto buffer = make_unique<OBuffer>(nRead);
+  int rLen = BIO_read(m_impl->m_sink, &(*buffer)[0], nRead);
+  if (rLen < 0)
+    return;
+
+  if (rLen < nRead)
+    buffer->erase(buffer->begin() + rLen, buffer->end());
+  setOutputBuffer(std::move(buffer));
+}
+
+bool
+Base64Encode::isConverterEmpty()
+{
+  return (BIO_pending(m_impl->m_sink) <= 0);
+}
+
+unique_ptr<Transform>
+base64Encode(bool needBreak)
+{
+  return make_unique<Base64Encode>(needBreak);
+}
+
+} // namespace transform
+} // namespace security
+} // namespace ndn