diff --git a/command/open_session.cpp b/command/open_session.cpp
new file mode 100644
index 0000000..0c17d3d
--- /dev/null
+++ b/command/open_session.cpp
@@ -0,0 +1,93 @@
+#include "open_session.hpp"
+
+#include <iostream>
+
+#include "comm_module.hpp"
+#include "endian.hpp"
+#include "main.hpp"
+
+namespace command
+{
+
+std::vector<uint8_t> openSession(std::vector<uint8_t>& inPayload,
+                                 const message::Handler& handler)
+{
+    std::cout << ">> openSession\n";
+
+    std::vector<uint8_t> outPayload(sizeof(OpenSessionResponse));
+    auto request = reinterpret_cast<OpenSessionRequest*>(inPayload.data());
+    auto response = reinterpret_cast<OpenSessionResponse*>(outPayload.data());
+
+    // Check for valid Authentication Algorithms
+    if (request->authAlgo != static_cast<uint8_t>
+        (cipher::rakp_auth::Algorithms::RAKP_HMAC_SHA1))
+    {
+        response->status_code =
+            static_cast<uint8_t>(RAKP_ReturnCode::INVALID_AUTH_ALGO);
+        return outPayload;
+    }
+
+    // Check for valid Integrity Algorithms
+    if (request->intAlgo != 0)
+    {
+        response->status_code =
+            static_cast<uint8_t>(RAKP_ReturnCode::INVALID_INTEGRITY_ALGO);
+        return outPayload;
+    }
+
+    // Check for valid Confidentiality Algorithms
+    if (request->confAlgo != 0)
+    {
+        response->status_code =
+            static_cast<uint8_t>(RAKP_ReturnCode::INVALID_CONF_ALGO);
+        return outPayload;
+    }
+
+    std::shared_ptr<session::Session> session;
+    try
+    {
+        // Start an IPMI session
+        session = (std::get<session::Manager&>(singletonPool).startSession(
+                  endian::from_ipmi<>(request->remoteConsoleSessionID),
+                  static_cast<session::Privilege>(request->maxPrivLevel),
+                  static_cast<cipher::rakp_auth::Algorithms>(request->authAlgo)
+                  )).lock();
+    }
+    catch (std::exception& e)
+    {
+        std::cerr << e.what() << "\n";
+        response->status_code = static_cast<uint8_t>
+                                (RAKP_ReturnCode::INSUFFICIENT_RESOURCE);
+        std::cerr << "openSession : Problem opening a session\n";
+        return outPayload;
+    }
+
+    response->messageTag = request->messageTag;
+    response->status_code = static_cast<uint8_t>(RAKP_ReturnCode::NO_ERROR);
+    response->maxPrivLevel = static_cast<uint8_t>(session->curPrivLevel);
+    response->remoteConsoleSessionID = request->remoteConsoleSessionID;
+    response->managedSystemSessionID = endian::to_ipmi<>
+                                       (session->getBMCSessionID());
+
+    response->authPayload = request->authPayload ;
+    response->authPayloadLen = request->authPayloadLen ;
+    response->authAlgo = request->authAlgo;
+
+    response->intPayload = request->intPayload ;
+    response->intPayloadLen = request->intPayloadLen ;
+    response->intAlgo = request->intAlgo;
+
+    response->confPayload = request->confPayload ;
+    response->confPayloadLen = request->confPayloadLen ;
+    response->confAlgo = request->confAlgo;
+
+    session->updateLastTransactionTime();
+
+    // Session state is Setup in progress
+    session->state = session::State::SETUP_IN_PROGRESS;
+
+    std::cout << "<< openSession\n";
+    return outPayload;
+}
+
+} // namespace command