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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. The authors' 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.
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