Vehicular ad hoc networks (VANETs) have attracted extensive attentions in recent years for their promises in improving safety and\r\nenabling other value-added services. In this paper, we propose an efficient noninteractive secure protocol preserving the privacy of\r\ndrivers in vehicle-to-roadside (V2R) communication networks with the ability of tracing malicious drivers only by a third trusted\r\nparty (TTP), who is assumed to be fully trusted. Our proposed protocol can provide these complex requirements depending on\r\nsymmetric cryptographic algorithms. The drivers can change the symmetric key used for message encryption with each message\r\ntransmission and find noninteractively new values to be correctly used for verification and tracing in case of malicious behavior.\r\nThe advantages of symmetric cryptographic algorithms over asymmetric algorithms are the faster processing speed and the shorter\r\nmessage length which makes it suitable for real-time applications such as V2R communications. An efficient key revocation scheme\r\nwill be also described.
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