Adaptive Privacy-Preserving Authentication in Vehicular Networks

Abstract

Abstract-Vehicular networks have attracted extensive attentions in recent years for their promises in improving safety and enabling other value-added services. Most previous work focuses on designing the media access and physical layer protocols. Privacy issues in vehicular systems have not been well addressed. We argue that privacy is a user-specific concept, and a good privacy protection mechanism should allow users to select the degrees of privacy they wish to have. To address this requirement, we propose an adaptive privacy-preserving authentication mechanism that can trade off the privacy degree with computational and communication overheads (resource usage). This mechanism, to our knowledge, is the first effort on adaptive privacy-preserving authentication. We present analytical and preliminary simulation results to show that the proposed protocol is not only adaptive but also scalable.

Cooperative anonymity authentication in Vehicular Networks

“…VANET). When comparing this protocol to previous work [2][3], RSU should provide fairness to all OBUs while sustaining anonymity authentication service, e.g., prevents DoS attack. we would like to address attack issue.…”

“…The protocol that we will describe is based on the previous work [1] [2]. We consider privacy issues in VANET, and integrate it with anonymity models considering background knowledge attack, t-closeness attack, then we customize to add more features, (1) allow the OBU to form a group by randomized algorithm or prepare multiple groups depending on varied privacy needs using database queries, and (2) treat OBU and RSU rational players, (3) allow RSU adjust anonymity group level to avoid prisoner dilemma effect [5], (4) allow RSU give client puzzle [6] for suspicious anonymity request to prevent DoS attack.…”

“…The existing protocol design [2] uses a complete binary tree over the ordered list, in which the public keys are leaves in the tree and internal nodes are IDs to identify each subtrees. The group can be selected using a subtree root.…”

“…From anonymity authentication in dynamic group [1] to VANET, protocol extension [2] is based on k-anonymity model, and OBU customizes its anonymity group size which is userspecific, also called adaptive. In further protocol extension [3], OBU can do probabilistic verification to save computation cost.…”

“…In protocol extension to VANET, k-anonymity model was selected in protocol [2][3], OBU ensures that it forms a group with size k big enough for privacy concern. The extended protocol mainly focuses on RSU server probing attack, which is to break anonymity group size k. In this protocol, we extend the protocol in VANET considering that RSU can launch more efficient data analysis instead of k-anonymity group size as seen in all data privacy models analysis.…”