Browsing by Author "Srinivasan, Naveen"
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ItemAuthorization and Privacy for Semantic Web Services(IEEE, 2004-07-01) Kagal, Lalana; Paoucci, Massimo; Srinivasan, Naveen; Denker, Grit; Finin, Tim; Sycara, KatiaWhen choosing, composing, invoking or monitoring a service it may be important or even critical to understand it's security attributes and policies. By security, we refer to a range of related aspects including authentication, authorization, confidentiality and privacy. We discuss how to incorporate security information into the OWL-S Semantic Web service model by integrating descriptions of semantically rich policies for authorization, privacy and confidentiality. These policies can include conditions on attributes of the service requester, provider, and the general context. We describe the ontologies used to annotate OWL-S input and output parameters with respect to their security characteristics, including various types of encryption and digital signatures. We present an algorithm for testing policy compliance that can be integrated into the service selection process of the OWL-S MatchMaker. This integration allows the requester to invoke only those services that match the formers policies and whose policies are met by the requester. ItemEnabling Peer-to-Peer Resource Discovery in Agent Environment(2002-07-07) Srinivasan, Naveen; Finin, TimNegotiation, co-operation and collaboration between muti-agents systems is the key to success in the agent world. An agent that is capable of these actions can offer them as services. the main challenge lies in discovering the agents that provides and services. FIPA architecture facilitates service discovery process with the help of Directory Facilitator (DF), but the service discovery process is limited to a particular Agent Platform. Federation between the DFs would lead to a Gnutella type peer-to-peer network, which is neither scalable nor efficient. In this paper we propose modifications to existing Directory Facilitator to enhance the global service discover among the agent platform. We propose a scalable architecture, which forms decentralized clusters of Directory Facilitators. These clusters are self-governing, fault-tolerant and support global service discovery. We also discuss ways of improving the performance of the service discovery process using the architecture.