Rolf Michelsen

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CAFE (“Conditional Access for Europe”) is an ongoing project in the European Community's ESPRIT program. The goal of CAFE is to develop innovative systems for conditional access, and in particular, digital payment systems. An important aspect of CAFE is high security of all parties concerned, with the least possible requirements that they are forced to(More)
In this paper we study several dimensions of web dynamics in the context of large-scale Internet search engines. Both growth and update dynamics clearly represent big challenges for search engines. We show how the problems arise in all components of a reference search engine model. Furthermore, we use the FAST Search Engine architecture as a case study for(More)
Cloud computing is the notion of abstracting and outsourcing hardware or software resources over the Internet, often to a third party on a pay-as-you-go basis. This emerging concept is sometimes claimed to represent a completely new paradigm, with disruptive effects on our means of viewing and accessing computational resources. In this thesis, we(More)
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