The remainder of the paper is organized as follows. Section 2 surveys related work. Section 3 presents the overall architecture. Section 4 details the core algorithms. Section 5 discusses security and privacy mechanisms. Section 6 reports experimental results. Section 7 provides a critical discussion, and Section 8 concludes with future directions.






The remainder of the paper is organized as follows. Section 2 surveys related work. Section 3 presents the overall architecture. Section 4 details the core algorithms. Section 5 discusses security and privacy mechanisms. Section 6 reports experimental results. Section 7 provides a critical discussion, and Section 8 concludes with future directions.