#region Exchange Data  (Secure channel) useroption 1
                // Send data...
                int money = 42;
                byte[] encryptedData = symmetricsSI.Encrypt(BitConverter.GetBytes(money));
                Console.Write("Sending  data... ");
                msg = protocol.Make(ProtocolSICmdType.USER_OPTION_1, encryptedData);
                netStream.Write(msg, 0, msg.Length);
                Console.WriteLine("ok.");

                Console.WriteLine("Encrypted data sent (HEX): {0}", ProtocolSI.ToHexString(encryptedData));

                // Receive answer from server
                Console.Write("waiting for conversion... ");
                netStream.Read(protocol.Buffer, 0, protocol.Buffer.Length);
                byte[] encryptedConvertion = protocol.GetData();
                int convertion = BitConverter.ToInt32(symmetricsSI.Decrypt(encryptedConvertion), 0);
                Console.WriteLine("\nconvertion : " + convertion);
                Console.WriteLine("ok.");
                #endregion

                Console.WriteLine(SEPARATOR);

                #region Exchange Data  (Secure channel) useroption2
                // Send data...
                money = 4200;
                encryptedData = symmetricsSI.Encrypt(BitConverter.GetBytes(money));
                Console.Write("Sending  data... ");
                msg = protocol.Make(ProtocolSICmdType.USER_OPTION_2, encryptedData);
                netStream.Write(msg, 0, msg.Length);
                Console.WriteLine("ok.");

                Console.WriteLine("Encrypted data sent (HEX): {0}", ProtocolSI.ToHexString(encryptedData));

                // Receive answer from server
                Console.Write("waiting for conversion... ");
                netStream.Read(protocol.Buffer, 0, protocol.Buffer.Length);
                encryptedConvertion = protocol.GetData();
                convertion = BitConverter.ToInt32(symmetricsSI.Decrypt(encryptedConvertion), 0);
                Console.WriteLine("\nconvertion : " + convertion);
                Console.WriteLine("ok.");
                #endregion