Towards purpose enforcement model for privacyaware usage control policy in distributed healthcare

Enforcing the purpose of data usage means to ensure that data are used as it intends for and that excessive usage cannot happen. In general, the enforcement of purpose is a complicated task. The main difficulty is to identify the purpose of an agent when it requests to perform an action. In this paper, we discuss the design issue of usage purpose enforcement model based on our proposed enforcement structure: pre-, ongoing-, and post-enforcement. We also propose an enforcement solution for usage control designed for distributed healthcare information system, particularly, the pre- and ongoing-enforcement of purpose. Furthermore, we validate our model with a prototype developed in Java.