A privacy protection method for a location sharing system in a mobile social network

Abstract

The present invention aims at the technical problem of location privacy protection for nearby friend and stranger search services in mobile online social networks, and proposes a privacy protection method for location sharing systems in mobile social networks that realize nearby friend search and stranger search . The present invention comprehensively considers the particularity of nearby friend search and stranger search services relative to traditional location-based services, and can protect the user's social relationship privacy in addition to protecting the user's location privacy. In the present invention, when users use location sharing services such as Find Friends Nearby and Find Strangers Nearby, they can choose the object to share their location with, that is, allow users to choose to expose their location to some of their friends, not all of them. The protection strategy proposed by the invention is more efficient than the existing privacy protection method, and can find nearby friends and strangers more quickly.

Description

technical field [0001] The invention belongs to the technical field of mobile communication, and in particular relates to privacy protection of a location sharing system in a mobile social network. Background technique [0002] With the rapid development of mobile communication technology and social networks and the popularization of high-performance smart mobile devices, traditional location-based services and social networks are constantly merging to form a mobile online social network. Mobile online social networks provide more location sharing services, users can not only find nearby friends and strangers, but also check-in services. Mobile social networks combine real location services with virtual communities, enriching people's social methods. However, when users enjoy the convenience brought by location-based services, they also bear the risk of sensitive information leakage. [0003] When a user sends a location service request, an attacker can not only associate ...

AI Technical Summary

Problems solved by technology

But it still has the following defects: (1) The dynamic user pseudonym contains the user's real social identity information, and the location server can infer the user's historical location based on the historical user pseudonym

(2) The computing resources of the user terminal are limited. Every time a friend or stranger is found, its location must be asymmetrically encrypted. The calculation time is almost proportional to the number of friends and the number of strangers.

In the case of a large number of friends and strangers, more calculation time is required

(3) This method allows the user to only share the location with all friends, without considering that in practical applications, the user may not trust all friends, and only hopes to share the location with some friends

But there are also the following disadvantages: (1) The system requires a trusted third-party server. Once the attacker successfully attacks the server, the historical locations of all users will be leaked

(2) The location privacy protection here mainly refers to the privacy protection of sensitive locations. It does not take into account that other locations can already expose the personal privacy of some users, such as activity areas, action trajectories, etc.

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