A location privacy protection method in sign-in service
A privacy protection, fake location technology, applied in the field of social network services, can solve the problem that the social network server cannot obtain the user's location information, does not take into account the needs of all the user's check-in records, and cannot issue the user's check-in reward to the user. The effect of stability, good location privacy protection, and good applicability
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[0045] figure 1 It is a flowchart of a location privacy protection method in a sign-in service of the present invention.
[0046] In this example, if figure 1 As shown, a location privacy protection method in a check-in service of the present invention comprises the following steps:
[0047] S1. The user maintains a local data table, which is used to store the places the user has checked in and the corresponding header table row number.
[0048] S2. Generate a false location candidate set
[0049] Let the number of locations sent to the social network server LBSN by the user's last check-in be k pre , and l real is the real position of the user at the current moment, therefore, there are k pre joint probabilities, respectively q(l pre_1 , l real ),...,q(l pre_kpre , l real ). Among them, l pre_1 ,...,l pre_kpre They are the k sent by the user to the LBSN during the last check-in pre locations. We find all positions satisfying the following two conditions, except ...
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