In this paper, we are going to show how to build up agentoriented Public Key Infrastructure(PKI) from SPKI/SDSI and X.509 standards. A variety of delegation mechanisms for agents will be demonstrated under this agent-oriented PKI. The mechanisms include: chain-ruled, threshold, and conditional. The lack of agent security management standards did not allow us to do the agent trust and delegation in legalized manner so we proposed several new communicative acts to satisfy our agent delegation management. Finally, we briefly show how to implement these agent communication language and inner content language in XML and XML/RDF.

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In this paper, we encompass and extend previous ontologybased data integration system. A semantic privacy-preserving model provides authorized view-based query answering over a widespread multiple servers for data sharing and integration. The combined semantics-enabled privacy protection policies are used to empower the data integration and access control services at the virtual platform (VP). The ontology mapping and merging algorithm with a local-as-view (LAV) source description that creates a global ontology schema at the VP by integrating multiple local ontology schemas for data sharing. The perfect rules integration of datalog rules enforces the data query and protection services. Semanticsenable policies are combined together at the VP, but the access control criteria specified in each server are still satisfied. Therefore the soundness and completeness of data sharing and protection criteria are ensured to support the validity of policy combination. This guarantees the trustworthiness of data sharing and protection services in multiple servers.

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Abstract-We propose a semantics-enabled layered policy architecture for the exchange and management of multiple policies created by different policy languages on the Web. This architecture consists of four layers: Unifying Logic (UNL), Policy Interchange Format (PIF), Privacy Protection/DRM (PPD), and Domain Specific Applications (DSA). A meta-Policy Interchange Format (meta-PIF) layer is also introduced, side by side with the corresponding PIF layer, allowing agents in the facilitator to provide uniform services of interchange, reconciliation, and combination of policies. This SemPIF architecture extends W3C's Semantic Web architecture to permit the reuse of earlier work. A scenario of agents in the facilitator employing SemPIF for Digital Rights Management (DRM) and privacy protection policies on digital library subscription services will be demonstrated.