Abstract: Vehicular ad hoc networks (VANETs) are emerging as functional technology for providing a wide range of applications to vehicles and passengers. Ensuring secure functioning is one of the prerequisites for deploying reliable VANETs. However, the open-medium nature of these networks and the high-speed mobility of a large number of vehicles harden the integration of primary security requirements such as authentication, message integrity, non-repudiation, and privacy. Vehicular ad hoc networks (VANETs) enable vehicles to communicate with each other and with roadside units (RSUs). REACT system that takes advantage of the RSUs that are connected to the Internet and that provide various types of information to VANET users. REACT faced a problem of delay, hence an enhanced version of REACT is proposed called M-REACT. In M-REACT focuses on making the proposed system more scalable in terms of the number of users that can connect to an RSU. M-REACT provides the security for data and scheduling mechanism of RSU divided into number of time slots. Public key cryptography or public key certificate is about a set of techniques that together combine in a particular system to enable secure communication. This work aims to promote the use of x.509 certificate due to its ability to reduce security risks. The results are compared to those of another system, its feasibility and efficiency.

Keywords: service oriented vehicular ad hoc network, x.509 certificate, road side unit (rsu), security, m-react, public key infrastructure.