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Recently, several studies addressed security and privacy issues in vehicular ad hoc networks (VANETs). Most of them focused on safety applications. As VANETs will be available widely, it is anticipated that Internet services could be accessed through VANETs in the near future. Thus, non-safety applications for VANETs would rise in popularity. This paper(More)
Vehicular ad hoc networks (VANETs) are an emerging wireless network technology used to improve road safety. Commercial services will play an important role in drawing customers to VANETs. Therefore, service-oriented vehicular networks offer an effective and promising approach. To meet the diverse requirements of different users, fine-grained access control(More)
To support the high mobility of vehicles, the Internet Engineering Task Force (IETF) defines proxy mobile IPv6 (PMIPv6) to reduce the signaling overhead. However, the design of PMIPv6 does not thoroughly consider security issues, such as man-in-the-middle and impersonation attacks. Moreover, the traditional authentication/authorization/accounting (AAA)(More)
—Online social networks (OSNs) such as Facebook and MySpace are flourishing because more and more people are using OSNs to share their interests with friends. Because security and privacy issues on OSNs are major concerns, we propose a security framework for simultaneously authenticating multiple users to improve the efficiency and security of peer-to-peer(More)
In this paper, we propose a novel integrated authentication and access control scheme using smart cards. A list of accessible resources with privileges is encrypted in the smart card issued to the user. Without storing access control information, a server can authenticate each user, realize resources to be accessed, and determine access privileges. We(More)
In this paper, we propose a Hierarchical Role-based Data Dissemination approach, named HRDD, for large-scale wireless sensor networks with multiple mobile sinks. In HRDD, we use a hierarchical cluster-based structure to discover and maintain the routing paths for distributing data to the mobile sink. We assign two roles, named Indexing Agent and Gateway(More)