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A distributed access control module in Wireless Sensor Networks (WSNs) allows the network to authorize and grant user access privileges for in-network data access. Prior research mainly focuses on designing such access control modules for WSNs, but little attention has been paid to protect user's identity privacy when a user is verified by the network for data accesses. Often, a user does not want the WSN to associate his identity to the data he requests. In this paper, the authors present the design, implementation, and evaluation of a novel approach, Priccess, to ensure distributed privacy-preserving access control. In Priccess, users who have similar access privileges are organized into the same group by the network owner.
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