Abstract
Service computing technology enables B2B scenarios where the provision of a service may require a collaboration among several service providers across multiple independent and heterogeneous administrative domains. In these environments, several new security and privacy challenges arise, mainly related to resource sharing and interoperability among different providers. Policy management frameworks are a powerful mechanism to deal with this heterogeneity, although many issues still have to be faced with. In particular, policy matching is today carried out following a syntactical approach, which may impair the selection of suitable services on the one hand, and the flexibility of the matching process on the other one. In this work we propose a semantic approach that, by allowing WS-Policy assertions to reference semantic concepts, provides for a better matching of security requirements and capabilities. The proposed approach has been validated through a case study that shows how a pure syntactic-based mechanism of WS-Policy would have failed in matching two actually compatible policies.
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