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Vehicular communications play a substantial role in providing safetytransportation by means of safety message exchange. Researchers have proposedseveral solutions for securing safety messages. Protocols based on a fixed keyinfrastructure are more efficient in implementation and maintain strongersecurity in comparison with dynamic structures. The purpose of this paperpresent a method based on a fixed key infrastructure for detectionimpersonation attack, in other words, Sybil attack, in the vehicular ad hocnetwork. This attack, puts a great impact on performance of the network. Theproposed method, using an cryptography mechanism to detection Sybil attack.Finally, using Mat lab simulator the results of this approach are reviewed,This method it has low delay for detection Sybil attack, because mostoperations are done in Certification Authority, so this proposed schema is aefficient method for detection Sybil attack.

Efficient Detection of Sybil Attack Based on Cryptography in Vanet