ABSTRACT

Today Vehicular Ad-hoc Networks (VANETs) are needful to improve safety on the roads. But using this kind of networks has a few issues. Providing security is one of the most important issues that users of VANETs are associated with. Our purpose of security is the reliability of information. Security is lost when a user or group of users try to send invalid information into the network for their individual purposes. The approach presented in this paper works by the following assumption. One of them is, a unique identifier (called ID) is assigned to each vehicle, and all the communicated messages contain this ID. The approach works by keeping the history of reported messages. By using probabilistic roles, we show that in an unsecure/secure environment how many reports is necessary to rely on a report (message). This reliability helps the driver in making true decisions when he has no information about the message trueness. E.g., message contains the information that an incident (collision, accident and etc) has occurred in a specific place on your way. You may change your way. But you need to ensure the message is true. Our proposed approach is based on this fact that how more an incident is reported it has more probability to be true. In the cases that message validity is not guarantied driver is responsible for trust to received information. At the end, some diagrams show, in different environment, how many reports should be received to rely on a specific report.