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Vehicular networks face a typical quandary in their requirement for communications that are at once secure and private. While the messages broadcast between vehicles and between vehicles and the supporting infrastructure must be authentic and non repudiable, they must also ensure the vehicle driver's anonymity. The Dedicated Short Range Communications (DSRC) framework's Wireless Access in Vehicular Environments (WAVE) application development architecture mandates the use of Public Key Infrastructure (PKI) mechanisms for securing messages, consequently compromising the driver's expectation of privacy. In this paper, we propose a WAVE-based protocol for the secure and anonymous propagation of vehicle safety broadcast messages. A hybrid key infrastructure approach is put forth which combines the use of a shared network authorization key for devices that require anonymity and PKI for devices that do not.

Providing software that is efficient, flexible, reusable and easy to work with is a hard task for simulation developers. In this paper we propose the use of XML and its related tools (e.g. JAXB, XQuery, XSLT, and Native XML Database) for the implementation of a technology-unified data pipeline targeted to interactive simulation. We introduce a technology-independent conceptual data model as the basis for every simulation framework. We show that XML is a well-suited technology to be used in that context. We propose a data modeling methodology that takes its roots from Model-Driven Engineering (MDE). We also show a sample implementation that uses XML for transmitting data over the entire simulation loop. We thus present our experience in implementing that kind of architecture and discuss how the use of XML and associated technologies help in building a unified and generic data pipeline for interactive simulation.

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