Computational web portals provide uniform access to remote computational resources--hardware, software, and data--by hiding the complexity of the heterogeneous, distributed, high performance computing back end. These portal services may be implemented in a programming-language and platform independent way using a Web services approach. However, security in Web services for distributed computing systems is an open issue involving multiple security mechanisms and competing standards. In this paper we present an implementation of a flexible, message-based security system that can be bound to multiple mechanism and multiple message formats.
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