Node determination method and device for cooperative privacy protection

Abstract

The embodiment of the invention provides a node determination method and a device for cooperative privacy protection. The method is applied to each first node and comprises the following steps: sending an information inquiry request to a network; Identifying a responsive LBS server and a second node as candidate policy nodes of the first node; A candidate policy node is randomly selected and marked as the current policy node of the first node. When all the first nodes have the current policy node, the utility value of the current policy node is calculated. Calculating utility values of all candidate policy nodes except the current policy node, and marking the candidate policy node corresponding to the maximum utility value as the first candidate policy node of the first node; Updating a policy node corresponding to a maximum utility value in the first candidate policy node to a current policy node; When the current policy nodes of all the first nodes are no longer changed, the currentpolicy node of each of the first nodes is determined as the target policy node of the first node.

Description

technical field [0001] The invention relates to the technical field of network privacy security protection, in particular to a node determination method and device for cooperative privacy protection. Background technique [0002] With the rapid development of communication technology, mobile network and smart handheld terminals, location-based services (Location Based Service, LBS) are widely used. LBS brings great convenience to people's life. Users can share or obtain information through mobile applications. Various information in different points of interest (Point of Interest, POI). For example, users can find restaurants, leisure places, etc. they are interested in by providing location information to mobile applications, and users can also share pictures of the area when visiting certain places. [0003] In practical applications, when a user needs to obtain interested information based on the LBS service, the user needs to send an information query request to the LBS...

AI Technical Summary

Problems solved by technology

[0005] However, in this method of privacy protection through caching, the user randomly selects a user node that caches information as the target node for user information acquisition. When the selected target node is untrustworthy, the untrustworthy target node may collect and send information Query the requested user's private information, and then use the collected private information to perform inference attacks to infer and learn the user's real private information, resulting in the leakage of the user's privacy

Images