Abstract: Aiming at the shortage of the current methods, a location privacy-preserving method against attacks under P2P communication is proposed. The method builds anonymous group instead of anonymous area to ensure location k-anonymity through user’s collaboration. The introduction of speed makes that group members are not limited to the surrounding in the construction of anonymous group into the process of constructing. Group members keep fuzzy connectivity to resist malicious attacks. Through cache mechanism, anonymous group is reusable to resist multi-query attack and reduce overhead. The experimental results show that the method can achieve highly success rate of k-anonymity, resist those attacks and reduce the system overhead.

Key words: location privacy-preserving, P2P communication, anonymous group, cache mechanism, malicious attack

摘要： 针对目前位置隐私保护方法的不足，提出一种对等通信辅助下可抗攻击的位置隐私保护方法。该方法使用多用户协作构建匿名组代替匿名区域，保证位置k-匿名；将速度引入匿名组的构建，使组内用户不局限于周边；让组内用户保持模糊的连通，以此抵御一般恶意攻击；通过缓存机制增加匿名组的可重用性，以此抵御连续查询攻击，并减少开销。实验结果表明，该方法可以达到位置k-匿名，匿名成功率较高，能够抵御一般恶意攻击和连续查询攻击，且可减少系统开销。

关键词: 位置隐私保护, 对等通信, 匿名组, 缓存机制, 恶意攻击