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The VersaKey Framework: Versatile Group Key Management
(1998)TIK ReportMiddleware supporting secure applications in a distributed environment faces several challenges. Scalable security in the context of multicasting or broadcasting is especially hard when privacy and authenticity is to be assured to highly dynamic groups where the application allows participants to join and leave at any time. Unicast security is well-known and has widely advanced into production state. But proposals for multicast security ...Report -
The design and implementation of a flexible middleware for multimedia communications comprising usage experience
(1998)TIK ReportDistributed multimedia applications require a variety of communication services. These services and different application demands have to be provided and supported within end-systems in an efficient and integrated manner, combining the precise specification of Quality-of-Service (QoS) requirements, application interfaces, multicast support, and security features. The Da CaPo++ system presented in this paper provides an efficient middleware ...Report -
The WaveVideo system and network architecture: design and implementation
(1998)TIK ReportWireless video in acceptable quality is only possible by following an end-to-end approach. WaveVideo is an integrated, adaptive video coding architecture designed for heterogeneous wireless networks. It includes basic video compression algorithms based on wavelet transformations, an efficient channel coding, a filter architec ture for receiver-based media scaling, and error-control methods to adapt video transmissions to the wireless ...Report -
Efficient security for large and dynamic multicast groups
(1998)TIK ReportProposals for multicast security that have been published so far are complex, often require trust in network components or are inefficient. In this paper we propose a series of novel approaches for achieving scalable security in IP multicast, providing group-wide privacy and authentication. They can be employed to efficiently secure multi-party applications where members of highly dynamic groups of arbitrary size may participate. Supporting ...Report -
Project Da CaPo++, volume III: performance evaluations
(1998)TIK ReportPerformance evaluations of advanced communication subsystems and their applications are necessary methods to prove that a certain level of communication functionality demanded and a required minimal processing power of end-systems (workstations) and of intermediate systems (networks and routers) have been achieved. The communication middleware package Da CaPo++ provides a modern communication platform that supports flexible communication ...Report