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In this paper we address security of semantic Web services that are declaratively described in OWL-S. We propose ontologies to annotate OWL-S input and output parameters with respect to their security characteristics, including encryption and digital signatures. Moreover, we propose to incorporate privacy and authentication policies into OWL-S descriptions and requester profiles. We designed and implemented algorithms to check policy compliance and integrated them in the service selectiondoi:10.1109/mis.2004.23 fatcat:6joffesvsnecfjp66bwwqmjrw4