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|Title||Privacy Preserving Secure Communication Protocol for Vehicular AD HOC Network (Vanet)|
Vehicular Ad-hoc Networks (VANETs) have attracted much attention recently because of its applications and features. The main purpose of adopting VANET technology is to increase safety and efficiency on roads. In VANET, vehicles broadcast safety messages periodically. Considering security with preserving privacy of vehicles in VANET is very important. Unauthorized tracking of vehicles is a major problem which violates privacy requirement. Therefore, an anonymous message authentication scheme should be used. In this thesis, a privacy preserving secure communication protocol (PPSCP) for VANET is proposed to address the issue on anonymous authentication for safety messages with authorized traceability. In PPSCP, vehicles authenticate safety messages with shared symmetric keys using Message Authentication Code (MAC) algorithm. The trusted authority generates and distributes shared keys to all legitimate vehicles through road-side units (RSUs). All vehicles use the same shared key at the same time which hides the sender identity. Moreover, authorized tractability by a trusted authority can be achieved without affecting privacy. The vehicle identity is encrypted with the public key of the trusted authority. This scheme allows only the trusted authority to reveal the vehicle's identity because it is the only entity which has the corresponding private key. The protocol is designed to be resistant to attacks like replay attack. The proposed protocol suggests a new scheme for revocation which strongly reduces the size of revocation lists. In this scheme, each vehicle has its own revocation key which is updated periodically. The revocation key is used to encrypt a defined value which is included in the message. The receiver tries to decrypt the encrypted value with all revocation keys which are included in the revocation list. The trusted authority is responsible for creating and maintaining the revocation list. When a misbehaved vehicle is detected, its revocation key will be added to the revocation list. The vehicle will be anonymous until it is revoked. The revocation list is broadcasted periodically to all vehicles. This suggested scheme keeps the revocation list small by removing expired revocation keys. A security analysis was performed which demonstrates that PPSCP is secure and provides privacy preservation and liability effectively. PPSCP performance is evaluated through a simulation which shows that the proposed protocol is robust and efficient in compare with the S3P protocol.
|Publisher||the islamic university|
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