Vehicular communications by means of exchanging safety message considerably reduces life and property damage. So securing this message is essential. In this paper, we focus on protocols based on a fixed key infrastructure that establish stronger security in comparison with dynamic structures. These protocols have some problems in terms of implementation issues. In effect, a very important issue is high mobility of vehicles over these networks and their change of region.In this paper, we propose solutions for informing vehicles about region change to obtain new key set before entering next region. We also make key request messages secure by confirming old CA's public key to the message. At the end, a solution for compliance with broadcasting protocols is offered. For evaluation, we compare our method with other security solution based on four performance criteria.

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