diff --git a/src/detail/profile-storage.cpp b/src/detail/profile-storage.cpp
new file mode 100644
index 0000000..f880d1b
--- /dev/null
+++ b/src/detail/profile-storage.cpp
@@ -0,0 +1,103 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2017-2020, Regents of the University of California.
+ *
+ * This file is part of ndncert, a certificate management system based on NDN.
+ *
+ * ndncert is free software: you can redistribute it and/or modify it under the terms
+ * of the GNU General Public License as published by the Free Software Foundation, either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * ndncert 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 General Public License for more details.
+ *
+ * You should have received copies of the GNU General Public License along with
+ * ndncert, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * See AUTHORS.md for complete list of ndncert authors and contributors.
+ */
+
+#include "detail/profile-storage.hpp"
+#include "identity-challenge/challenge-module.hpp"
+#include "name-assignment/assignment-func.hpp"
+#include <ndn-cxx/util/io.hpp>
+#include <boost/filesystem.hpp>
+
+namespace ndn {
+namespace ndncert {
+namespace requester {
+
+void
+ProfileStorage::load(const std::string& fileName)
+{
+  JsonSection configJson;
+  try {
+    boost::property_tree::read_json(fileName, configJson);
+  }
+  catch (const std::exception& error) {
+    NDN_THROW(std::runtime_error("Failed to parse configuration file " + fileName + ", " + error.what()));
+  }
+  if (configJson.begin() == configJson.end()) {
+    NDN_THROW(std::runtime_error("No JSON configuration found in file: " + fileName));
+  }
+  load(configJson);
+}
+
+void
+ProfileStorage::load(const JsonSection& configSection)
+{
+  m_caItems.clear();
+  auto caList = configSection.get_child("ca-list");
+  for (auto item : caList) {
+    CaProfile caItem;
+    caItem.parse(item.second);
+    if (caItem.m_cert == nullptr) {
+      NDN_THROW(std::runtime_error("No CA certificate is loaded from JSON configuration."));
+    }
+    m_caItems.push_back(std::move(caItem));
+  }
+}
+
+void
+ProfileStorage::save(const std::string& fileName) const
+{
+  JsonSection configJson;
+  for (const auto& caItem : m_caItems) {
+    configJson.push_back(std::make_pair("", caItem.toJson()));
+  }
+  std::stringstream ss;
+  boost::property_tree::write_json(ss, configJson);
+  std::ofstream configFile;
+  configFile.open(fileName);
+  configFile << ss.str();
+  configFile.close();
+}
+
+void
+ProfileStorage::removeCaProfile(const Name& caName)
+{
+  m_caItems.remove_if([&](const CaProfile& item) { return item.m_caPrefix == caName; });
+}
+
+void
+ProfileStorage::addCaProfile(const CaProfile& profile)
+{
+  for (auto& item : m_caItems) {
+    if (item.m_caPrefix == profile.m_caPrefix) {
+      item = profile;
+      return;
+    }
+  }
+  m_caItems.push_back(profile);
+}
+
+const std::list<CaProfile>&
+ProfileStorage::getCaItems() const
+{
+  return m_caItems;
+}
+
+} // namespace requester
+} // namespace ndncert
+} // namespace ndn