diff --git a/src/ca-detail/ca-memory.cpp b/src/ca-detail/ca-memory.cpp
new file mode 100644
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--- /dev/null
+++ b/src/ca-detail/ca-memory.cpp
@@ -0,0 +1,114 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2017, 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 "ca-memory.hpp"
+
+namespace ndn {
+namespace ndncert {
+
+const std::string
+CaMemory::STORAGE_TYPE = "ca-storage-memory";
+
+NDNCERT_REGISTER_CA_STORAGE(CaMemory);
+
+CertificateRequest
+CaMemory::getRequest(const std::string& requestId)
+{
+  auto search = m_requests.find(requestId);
+  if (search == m_requests.end()) {
+    BOOST_THROW_EXCEPTION(Error("Request " + requestId + " doest not exists"));
+  }
+  return search->second;
+}
+
+void
+CaMemory::addRequest(const CertificateRequest& request)
+{
+  auto search = m_requests.find(request.getRequestId());
+  if (search == m_requests.end()) {
+    m_requests[request.getRequestId()] = request;
+  }
+  else {
+    BOOST_THROW_EXCEPTION(Error("Request " + request.getRequestId() + " already exists"));
+  }
+}
+
+void
+CaMemory::updateRequest(const CertificateRequest& request)
+{
+  m_requests[request.getRequestId()] = request;
+}
+
+void
+CaMemory::deleteRequest(const std::string& requestId)
+{
+  auto search = m_requests.find(requestId);
+  if (search != m_requests.end()) {
+    m_requests.erase(search);
+  }
+}
+
+// certificate related
+security::v2::Certificate
+CaMemory::getCertificate(const std::string& certId)
+{
+  security::v2::Certificate cert;
+  auto search = m_issuedCerts.find(certId);
+  if (search != m_issuedCerts.end()) {
+    cert = search->second;
+  }
+  return cert;
+}
+
+void
+CaMemory::addCertificate(const std::string& certId, const security::v2::Certificate& cert)
+{
+  auto search = m_issuedCerts.find(certId);
+  if (search == m_issuedCerts.end()) {
+    m_issuedCerts[certId] = cert;
+  }
+  else {
+    BOOST_THROW_EXCEPTION(Error("Certificate " + cert.getName().toUri() + " does not exists"));
+  }
+}
+
+void
+CaMemory::updateCertificate(const std::string& certId, const security::v2::Certificate& cert)
+{
+  auto search = m_issuedCerts.find(certId);
+  if (search == m_issuedCerts.end()) {
+    m_issuedCerts[certId] = cert;
+  }
+  else {
+    BOOST_THROW_EXCEPTION(Error("Certificate " + cert.getName().toUri() + " does not exists"));
+  }
+}
+
+void
+CaMemory::deleteCertificate(const std::string& certId)
+{
+  auto search = m_issuedCerts.find(certId);
+  if (search != m_issuedCerts.end()) {
+    m_issuedCerts.erase(search);
+  }
+}
+
+} // namespace ndncert
+} // namespace ndn