动态P2P网络中基于扇形区域的位置隐私保护

摘要

目前,已有的动态P2P网络环境中位置隐私保护的方法容易使相互协作的用户之间的位置过于集中,空间覆盖域较小,抗中心攻击能力较弱.针对这个问题,提出一种基于扇形区域的动态P2P位置隐私保护方法.通过移动用户之间的相互协作构建一条匿名链来转发查询信息,完成精确查询的同时在匿名链中隐藏了查询用户的真实位置.在匿名链建立的过程中,利用扇形区域限定匿名链的方向,同时考虑节点之间的连接稳定性,保证了匿名链的空间覆盖域及稳定性,从而提高了算法的匿名度及抗中心攻击能力.实验结果表明该算法在不同用户密度情况下,匿名性能及计算能耗均能取得较好的结果.%At present, the existing methods of location privacy protection in dynamic peer-to-peer (P2P) network frequently tend to make the cooperative users' locations to be too concentrated and the spatial covering domain to be relatively small.Their ability of anti-center-attack is also quite weak.Aiming at this problem, a method of location privacy protection based on sector region is proposed.An anonymous chain is constructed by the cooperation between mobile stations to forward inquired information and hide the users' real locations as completing accurate inquiries.The direction of anonymous chain is restricted by the sector region, and the stability of the link between the nodes has been taken into consideration while constructing the anonymous chain, so that its spatial covering domain and stability can be ensured.Then, the degree of anonymity and the ability of anti-center-attack can be improved.Experimental result shows that this algorithm performs relatively well in different density of users, whether the anonymity performance or computing consumption.