How and How Much Should We Disclose?

Privacy risks result in great barriers to the long-term success of pervasive computing. Unfortunately, related researches can still be considered in its infancy. Access control is widely used for privacy protection. However, traditional access control methods can only negating or approving accesses, greatly lacking flexibility. In this paper, we introduce the disclosing degree for end-users to precisely and flexibly specify their privacy requirements. We implement a disclosing degree based scheme in the middleware Shadow for privacy protection. We also demonstrate the effectiveness of our scheme by comprehensive case-studies.