Once again, the ACM Workshop on Web Service Security (SWS) offers a unique opportunity for presenting original research results, practical experiences, and innovative ideas in Service Oriented Architectures and XML security. The increasing importance of services-oriented computing for establishing a global informative infrastructure has brought Web service access control, data protection, privacy and trust to become key problems in software systems design. This central role of security in designing and implementing business processes and services poses a number of stimulating interdisciplinary research problems. >Like the previous editions, SWS 2008 has proved to be up to this challenge. The 2008 edition of SWS received 17 submissions, out of which the program committee selected 11 high quality papers. We are glad to see that the final program contains a well-balanced mix of theoretical results and practical prototype systems, many of them converging and building off each other. Also, the SWS program includes a number of pioneering papers on emerging aspects of Web service security research. Like every year, the research papers are complemented with an open panel on the perspectives of Web Service security and with an invited talk by Florian Kerschbaum pointing out the potential of service security techniques in achieving secure supply chain environments.
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