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Information brokering system (IBS) shares information via on-demand access. IBS connect large- scale loosely federated data sources via a brokering overlay. It is a peer-to-peer overlay network that comprises diverse data servers and brokering components, that helps client queries to locate the data server(s). Peer-to-peer (P2P) systems are gaining increasing popularity as a scalable means to share data among a large number of autonomous nodesand to balance the load. Here brokers routes the decisions to direct client queries to the requested data servers. The proposed novel approach is to preserve privacy of multiple stakeholders involved in the information brokering process. The system defines two privacy attacks, namely attribute- correlation attack and inference attack. The Privacy-Preserving Information Brokering in Distributed Information Sharing is achieved by an innovative automaton segmentation scheme and query segment encryption scheme. I. Introduction Along with the explosion of information collected by organizations in many realms ranging from business to government agencies, there is an increasing need for inter organizational information sharing to facilitate extensive collaboration. The effort spent for reunite data heterogeneity and interoperability providing. Balancing peer autonomy and system coalition is still challenging. Most of the existing systems work on on-demand information access, where peers are fully autonomous peers and managed by a unified DBMS. Take healthcare information systems as example. Regional Health Information Organization (RHIO) aims to facilitate access to and retrieval of clinical data across collaborative healthcare providers that include a number of regional hospitals, outpatient clinics, payers, etc. The provider requires full control on the data and the access to the data. A healthcare provider requesting data from other providers expects to preserve her privacy (e.g., identity or interests) in the querying process.

Security Enforcement with query routing Information Brokering in Distributed Information Sharing