We propose in this paper a security protocol based on periodic change of pseudonyms. The idea is to avoid illegal traceability of vehicles during their communications and preserve their privacy and confidential information. Two different approaches are proposed. In the first approach, each vehicle asks the central authority a new communication pseudonym after a time t. While in the second approach, each vehicle generates itself after a time t, a new communication pseudonym. Our objective is to permit at least two vehicles to change their pseudonym in the same time interval. We evaluate in this work, the bandwidth used by considering the vehicles speed in each approach. The proposed protocol is based on equidistant distribution of the road side unit and uses the average of speed permitted on the road to evaluate lifetime t of the communication's pseudonyms and certificates. The exchange of information is based on asymmetric and symmetric cryptography scheme and it uses hash function. Our protocol provides authentication, non-repudiation and privacy.

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In this paper, we introduce an efficient and dynamic elliptic curve qu-vanstone implicit certificates distribution scheme for vehicular cloud networks. We are concerned about how to achieve efficiently and dynamically certificates distribution with a reduced cost. We design an efficient mechanism that reduces the communication cost and the computational overhead for more safety and robustness of intelligent transportation systems. Our proposal enables vehicles to request and obtain implicit certificates upon a secure request, which can be used for further signing exchanged messages. Due to the restricted nature of these certificates, a simple and efficient revocation method has been presented. It is literally based on selective revocation message delivery technique that reduces the number of messages needed for revocation phase and solves a bunch of drawbacks of existing solutions. An extensive analysis is performed to demonstrate how the proposed scheme can dynamically carry out an effective certificates distribution. We further discuss and evaluate simulation results to demonstrate the merits gained by the proposed protocol.

Location privacy is one of the major security problems in a Wireless Body Area Networks (WBANs

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