Abstract
With the development of mobile positioning technology, location-based services are becoming more and more widely used in life, but it has produced the security problem of the user's privacy leakage. In this paper, the problem of user trajectory privacy protection in location-based services is introduced, and a method of trajectory privacy protection based on restraining trajectory in LBS is proposed. The proposed method is done by restraining the release of sensitive position and choosing a non-sensitive position that the user might stay at with the maximum probability to replace the sensitive position. So it will prevent the leakage of sensitive position of user's trajectory, and protect the user's activity trajectory, and give the method of calculating the privacy protection degree of restraining method.
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