Security is an important issue that should be taken care of by every system. In recent years, however, attackers are constantly developing themselves with new techniques to obtain personal information on the network. As systems evolve, the data that needs to be protected is increasingly appreciated and carries a higher risk of attack. As with many attacks such as MITM, there are solutions against this attacks. Nevertheless, these safety measures must be developed continuously. For this reason, we have developed a new system architecture with user-defined authentication against the intruders for the systems having large amount of data transmission rate. To maintain integrity of data, over a reliable system is that all incoming data are authenticated when data send to the server, on the other hand, in this system, the user-defined authentication can provide fast communication and it can decrease authentication time. The proposed system introduced in the present study checks for any changes in our instantaneous data. Moreover, we control the data integrity on simple devices such as sensors and motors or other industrial devices. Instead of using encryption, basically client-server based authentication system is used to avoid complex operations and protect the big data.Index Terms-Client-server based authentication, IIoT, MITM, Security M. KARA, is