• Pavithra M J
• Nirmala
• Shankara C

We are living in a world that is becoming increasingly networked on a daily basis, and we are witnessing a global transition in which all of the things that are in our immediate environment are becoming "smart" and connected to the Internet. In addition, the automotive industry is a component of this transformation. An in-vehicle network is created by the presence of more than 150 electronic control units (ECUs) in modern automobiles. This network is responsible for controlling the functions of the vehicle, similar to the fly-by-wire concept used in aviation. Each of these automobiles is equipped with many Internet connection points, allowing them to provide their passengers with a wide range of online services. Even while any item that connects to the Internet is vulnerable to a variety of online dangers, the linked automobile is also vulnerable to these dangers. As a result, it is becoming increasingly important to address the concerns regarding cyber security that are prevalent in the automobile industry. Electronic control units (ECUs) of vehicles are connected via several communication busses on the inside. Reading and sending data to other ECUs is possible for any ECU that is connected to the bus. As a consequence of this, if an adversary is successful in compromising one of the ECUs, then the adversary will be able to access and exploit the data of data stored on other significant ECUs. The primary reason for this is that there is no confidentiality about the matter. Furthermore, the communications are more susceptible to being compromised because there is a lack of either data integrity or authenticity. It has been demonstrated in the past that an enemy can take control of the vehicle by taking advantage of the inadequacies of CIA, which stands for confidentiality, integrity, and authenticity. If the integrity of an essential ECU is breached, an attacker has the ability to alter the data that is stored on the device. In order to address these issues, the purpose of this study is to propose the design of a message authentication framework that would enable the internal communication to be secured in an effective manner. Due to the fact that the calculation of the message authentication code is dependent on the Authentication Data, Secured Key, CMAC algorithm, and extra counters, the likelihood of a hacker mimicking a message to the vehicle network is significantly reduced. In addition to this, a test technique for the validation of the message authentication code is presented.

Control Area network (CAN) In-vehicle network, data authentication, message authentication code (MAC), CMAC Algorithm, ECU, CANoe, DaVinci Developer.

" EFFICIENT MESSAGE AUTHENTICATION CODE (MAC) BASED CYBER SECURITY FOR VEHICLE NETWORK", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 5, page no.24-33, May-2018, Available :http://www.jetir.org/papers/JETIR1805A07.pdf

" EFFICIENT MESSAGE AUTHENTICATION CODE (MAC) BASED CYBER SECURITY FOR VEHICLE NETWORK", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 5, page no. pp24-33, May-2018, Available at : http://www.jetir.org/papers/JETIR1805A07.pdf