A new network paradigm Ad HoC has been widely studied and developed; these are the vehicular ad hoc networks (VANETs - Vehicular Ad hoc Networks). Assuming that cars are increasingly "smart", the VANETs emerged with the proposal to provide communication among vehicles of highways. This communication aims to ensure greater security for members involved in transit. Seeking to ensure this security it is necessary that the data exchanged among vehicles are reliable. One of the techniques discussed in this proposal is the use of reputation systems. In this technique, the confidence in the vehicles is based on votes from its neighbors. In other words, the more vehicles have positive reviews, the more reliable they are and vice versa. In this work, the proposal was to model and simulate a centralized reputation system, where a central unit is responsible for managing reputations. With this centralized system, the reputations of vehicles that have been evaluated are stored indefinitely and can be accessed anytime and anywhere. With the implementation and simulation, we were able to demonstrate that a vehicle, after being evaluated, has its reputation available at any time and place, preventing this malicious vehicle to succeed in later attacks.
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