A Dynamic Privacy Protection Mechanism for Spatiotemporal Crowdsourcing

Algorithm 3

Dynamic publishing anonymous protection.

	Input: k-anonymous parameter k, aggregation result U from Algorithm 1, incremental dataset I, buffer pool dataset B
	Output: aggregation result D, buffer pool dataset
(1)	Calculate global dataset W=I + B
(2)	for to r do
(3)	Take the centroid set out of U
(4)
(5)
(6)	ifthen
(7)	,
(8)	Update the centroid of
(9)
(10)	end if
(11)	end for
(12)	forto r do
(13)	ifthen
(14)	Callback Algorithm4
(15)	input: k-anonymous parameter k, cluster M
(16)	output: aggregation result G
(17)	end if
(18)	,
(19)	end for
(20)	return,