For many years, the ACM Workshop on Web Service Security (SWS) has been a major forum for presenting original research results, practical experiences, and innovative ideas in Web services applications and XML security. Looking back, it is difficult not to appreciate the full extent of the change that occurred in our field. Once considered afterthoughts in application design, Web service access control, data protection, privacy and trust have become the key problems of our day. This central role of security in designing and implementing all sorts of business processes and services has however brought increased responsibilities to the research community. Today, practitioners and researchers alike need to find new ways to cope with the increasing scale and complexity of the security problems that must be solved on Service Oriented Architectures. >Like the previous editions, SWS 2007 has proved to be up to this challenge. The 2007 edition of SWS received 28 submissions, outof which the program committee selected 13 high quality papers covering a number of diverse research topics related to Web services and SOA security. 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 papers on new, emerging aspects of Web service security research.
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