A Privacy Preserving System for Friend Locator Applications

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Executive Summary

One interesting application of online social networks is the friend locator, in which the application server informs users through mobile devices if their listed friends are nearby in terms of geographical locations. However, in such services, it is challenging to protect the privacy of an individual user. Previous privacy protection solutions for friend locators do not guarantee a high level of privacy and maintain efficiency. In this paper, the authors propose a privacy preserving system to guarantee both strong privacy and efficiency.

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