一种增强的位置分享隐私保护方案*

目前，位置分享已经成为移动在线社交网络中一个非常重要的功能。与此同时，人们也对位置分享过程中产生的隐私泄露问题越来越担忧。如果得不到足够的隐私保护，用户很可能不愿意分享自己的位置信息。针对移动在线社交网络中位置分享的隐私保护问题，本文进行了深入的研究，指出了已有的保护方案的缺陷，提出了一个名为BMobishare 的安全方案。该方案改进了先前方案的架构，并采用位置加密和Bloom过滤器来阻止非法攻击。最后，通过安全分析和模拟实验，证明了BMobishare 方案能有效地保护用户位置和社交网络的隐私信息。

An enhanced privacy-preserving location sharing mechanism

Now, location sharing becomes a fundamental component of mobile Online Social Networks. At the same time, the need to share location information inevitably leads to significant privacy concerns. Without strong privacy guarantees, users may be unlikely to share their location information. In this paper, we make a further research on privacy-preserving location sharing on mobile Online Social Networks, and we note that some defects of previous mechanisms. In order to solve this problem, we present an enhanced mechanism namely BMobishare , which modifies the previous architecture and employs location encryption and the Bloom Filter to prevent adversary attack. Besides, the security analysis and performance evaluation make sure that BMobishare can protect both of user''s location privacy and social network privacy effectively.