User location personalized differential privacy protection method for location-based service
A technology of differential privacy and location services, which can be applied to location-based services, security devices, electrical components, etc., and can solve problems such as leakage of user location privacy.
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[0049] In this example, if figure 2 As shown, a location-based service-based user location personalized differential privacy protection method is applied to the query environment composed of users and service parties, and it is assumed that the adversary knows the prior probability of the user's location at any time ,Such as figure 1 As shown, the method is carried out as follows:
[0050] Step 1, using the index mechanism to generate the disturbance position;
[0051] Let χ t Indicates the set of possible locations of the user at time t, so that represents the set of positions χ t In the i-th position, i=1,2,...,card(χ t ), where card(χ t ) represents the position set χ t The cardinality of , that is, the position set χ t The number of positions included, let is the set of positions χ t The jth position in , and represents the real position of the user, 1≤j≤card(χ t ), using the exponential mechanism probability distribution shown in Equation (1) to generate...
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