Regulating service access and information release on the Web

The widespread use of Internet-based services is increasing the amount of information (such as user pro les) that clients are required to disclose. This information demand is necessary for regulating access to services, and functionally convenient (e.g., to support service customization), but it has raised privacy-related concerns which, if not addressed, may aect the users disposition to use network services. At the same time, servers need to regulate service access without disclosing entirely the details of their access control policy. There is therefore a pressing need for privacy-aware techniques to regulate access to services open to the network. We propose