diff --git a/src/security/safe-bag.cpp b/src/security/safe-bag.cpp
new file mode 100644
index 0000000..448847a
--- /dev/null
+++ b/src/security/safe-bag.cpp
@@ -0,0 +1,129 @@
+/* -*- 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.
+ *
+ * @author Zhiyi Zhang <dreamerbarrychang@gmail.com>
+ */
+#include "safe-bag.hpp"
+#include "encoding/tlv-security.hpp"
+#include "util/concepts.hpp"
+
+namespace ndn {
+namespace security {
+
+BOOST_CONCEPT_ASSERT((WireEncodable<SafeBag>));
+BOOST_CONCEPT_ASSERT((WireDecodable<SafeBag>));
+
+SafeBag::SafeBag() = default;
+
+SafeBag::SafeBag(const Block& wire)
+{
+  this->wireDecode(wire);
+}
+
+SafeBag::SafeBag(const Data& certificate,
+                 const Buffer& encryptedKeyBag)
+  : m_certificate(certificate)
+  , m_encryptedKeyBag(encryptedKeyBag)
+{
+}
+
+SafeBag::SafeBag(const Data& certificate,
+                 const uint8_t* encryptedKey,
+                 size_t encryptedKeyLen)
+  : m_certificate(certificate)
+  , m_encryptedKeyBag(encryptedKey, encryptedKeyLen)
+{
+}
+
+///////////////////////////////////////////////////// encode & decode
+
+template<encoding::Tag TAG>
+size_t
+SafeBag::wireEncode(EncodingImpl<TAG>& encoder) const
+{
+  size_t totalLength = 0;
+
+  // EncryptedKeyBag
+  totalLength += encoder.prependByteArrayBlock(tlv::security::EncryptedKeyBag,
+                                               m_encryptedKeyBag.get(),
+                                               m_encryptedKeyBag.size());
+
+  // Certificate
+  totalLength += this->m_certificate.wireEncode(encoder);
+
+  totalLength += encoder.prependVarNumber(totalLength);
+  totalLength += encoder.prependVarNumber(tlv::security::SafeBag);
+
+  return totalLength;
+}
+
+template size_t
+SafeBag::wireEncode<encoding::EncoderTag>(EncodingImpl<encoding::EncoderTag>& encoder) const;
+
+template size_t
+SafeBag::wireEncode<encoding::EstimatorTag>(EncodingImpl<encoding::EstimatorTag>& encoder) const;
+
+const Block&
+SafeBag::wireEncode() const
+{
+  EncodingEstimator estimator;
+  size_t estimatedSize = wireEncode(estimator);
+
+  EncodingBuffer buffer(estimatedSize, 0);
+  wireEncode(buffer);
+
+  this->m_wire = buffer.block();
+  return m_wire;
+}
+
+void
+SafeBag::wireDecode(const Block& wire)
+{
+  if (wire.type() != tlv::security::SafeBag)
+    BOOST_THROW_EXCEPTION(tlv::Error("Unexpected TLV type when decoding safebag"));
+
+  this->m_wire = wire;
+  m_wire.parse();
+
+  Block::element_const_iterator it = m_wire.elements_begin();
+
+  // Certificate must be the first part
+  if (it != m_wire.elements_end()) {
+    this->m_certificate.wireDecode(*it);
+    it++;
+  }
+  else
+    BOOST_THROW_EXCEPTION(tlv::Error("Unexpected TLV structure when decoding certificate"));
+
+  // EncryptedKeyBag
+  if (it != m_wire.elements_end() && it->type() == tlv::security::EncryptedKeyBag) {
+    this->m_encryptedKeyBag = Buffer(it->value(), it->value_size());
+    it++;
+  }
+  else
+    BOOST_THROW_EXCEPTION(tlv::Error("Unexpected TLV structure when decoding encryptedkeybag"));
+
+  // Check if end
+  if (it != m_wire.elements_end())
+    BOOST_THROW_EXCEPTION(tlv::Error("Unexpected TLV structure after decoding the block"));
+}
+
+} // namespace security
+} // namespace ndn