Abstract. Technologies like XML and Web Services have posed new requirements to authentication, authorization and identity management for the Web as an application platform. Beyond merely providing access control for a single isolated system, modern, flexible architectures support a business-spanning federation of applications and services by sharing digital identities. The diversity of today's specifications and the many aspects to be considered, like e.g. privacy, system integrity and distribution in the Web, makes the construction of these architectures a very time-consuming task. Thus, a uniform view on the overall system is needed that abstracts from technological issues. This can be achieved by extracting the core concepts from the emerging Federation technologies and specifications and formalize them to an extent that they can be used as a foundation for configurable applications and services. In this paper, we introduce a solution catalogue of reusable building blocks for Identity and Access Management (IAM). We also present a configurable system that supports IAM solutions in Web-service-based applications.
Product-related information can be found in various data sources and formats across the product lifecycle. Effectively exploiting this information requires the federation of these sources, the extraction of implicit information, and the efficient access to this comprehensive knowledge base. Existing solutions for product information management (PIM) are usually restricted to structured information, but most of the business-critical information resides in unstructured documents. We present a generic architecture for federating heterogeneous information from various sources, including the Internet of Things, and argue how this process benefits from using semantic representations. A reference implementation tailor-made to business users is explained and evaluated. We also discuss several issues we experienced that we believe to be valuable for researchers and implementers of semantic information systems, as well as the information retrieval community.
Today, the Web is increasingly used as a platform for distributed services, which transcend organizational boundaries to form federated applications. Consequently, there is a growing interest in the architectural aspect of Web-based systems, i.e. the composition of the overall solution into individual Web applications and Web services from different parties. The design and evolution of federated systems calls for models that give an overview of the structural as well as trust-specific composition and reflect the technical details of the various accesses. We introduce the WebComposition Architecture Model (WAM) as an overall modeling approach tailored to aspects of highly distributed systems with federation as an integral factor.
Abstract. With the growth of the World Wide Web, it has become more and more important to find implementation models tailored especially for Web applications. Unlike traditional applications, Web portals are required to be constantly up to date and are therefore often subject to changes at runtime. Consequently Web application frameworks have been developed that allow the construction and manipulation of Web pages consisting of pre-built components as an alternative to re-programming. The capability of such systems rises with the number of available components. Hence it is advisable to facilitate their deployment and exchange with a supporting architecture. The achieved increased use of third party components also results in higher risks for the provider of the portal. Especially the resource access by the contained code poses a potential threat and lowers the acceptance for foreign components. This paper proposes a robust architecture for the installation, administration and exchange of portal components and addresses the need for protection against malicious code.
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