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Group communication systems are high-availability distributed systems providing reliable and ordered message delivery as well as a membership service, to group-oriented applications. Many such systems are built using a distributed client-server architecture where a relatively small set of servers provide service to numerous clients. In this work, we show how group communication systems can be enhanced with security services without sacrificing robustness and performance. More specifically, wedoi:10.1109/tdsc.2005.39 fatcat:eksalcxi2bc3rkqyladmzom4e4