Abstract-With an increasing number of personalized information and services offered on the Internet, especially the World Wide Web, effective identity management solutions are demanded by application providers. Instead of a web-based stand-alone approach, we extend existing network-based AAA mechanisms to be useable for identity management by web applications. Our proposal, Diameter WebAuth, allows to seamlessly integrate webbased services into a Diameter infrastructure for authentication, authorization, credit-control and identity management purposes. Diameter WebAuth offers comparable features to web-based identity management solutions, benefits from the maturity and wide deployment of the Diameter protocol, and takes advantage of existing AAA setups.

Abstract-The wide availability of WiFi hot-spots provides mobile users with convenient access to the Internet. However, hot-spots cover only small areas and are often operated by a local authority. A user that roams between hot-spots effectively traverses different operators and access networks. Due to deployment complexity, IP mobility is usually not supported by the mobile node or the network.In this paper we propose an approach that enables access routers to provide seamless mobility support without any changes to the mobile node or other network entities. Our approach provides a simple, flexible, and deployable framework for mobility support and scales well with the number of involved access routers. By simulation and mathematical analysis, we show that even with lower deployment requirements and less support from the network, our approach performs well in terms of routing stretch, handover latency, and signaling overhead.

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I would like to express my gratitude to Prof. Dr. Xiaoming Fu for his supervision of this thesis, for his support and continuous guidance and for all the valuable insights and feedback he provided. His efforts helped me to continuously develop scientifically and personally during the entire time of my studies.