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Ad hoc vehicle networks (VANET) allow communications between vehicles and vehicles, especially , announcements produced by the vehicle. Cars may use these warnings to alert cars of road conditions in nearby areas. Thus, driving safety are often significantly increased. Their integrity must, however, be maintained. a replacement system for vehicle-generated announcements is introduced that's safe against external and internal attackers attempting to send fake messages. the utilization of a support mechanism supported multiple signatures risks internal attacks. In fact, this program guarantees that vehicles that volunteer for reliable announcements don't lose their rights.