Abstract
In participatory sensing, the task center is not always trustworthy. It may try to profile the participants by data mining, which is a great threat to the privacy of participants. The data exchange strategy can mix data and preserve privacy of participants well. But this requires cooperation among participants. To solve this problem, a trust management mechanism is presented to encourage neighboring participants to be collaborative. And the tit for tat strategy is employed to punish malicious neighboring participants. The analysis based on game theory shows that the reasonable neighboring participants will choose the cooperative strategy in data exchange with well-designed parameter settings.
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