Data Sharing in Presence of Access Control Policies

In the context of data analysis and data integration, very often information from different and autonomous sources are shared. Sources use their own schema and their own access control policies. We consider the case where data sources decide to share information by specifying entity matching rules between their contents. A query to a given data source is rewritten to produce queries to other data sources that share information with that data source. This entity-matching oriented and policy-oriented rewriting preserves local data source policies. In this paper, we describe our methodology for data sharing between sources by ensuring the satisfaction of local access control policies.