The existing continuous LBS query may lead the attacker to acquiring the private location information of the users by intercepting multiple query information. Firstly, the maximum mobile boundary attack is analyzed, then based on region partition and virtual user method, and by constructing reachable anonymous region and mixed user set, ak-anonymity privacy protection method that may resist maximum mobile boundary attacks is proposed. Meanwhile, the public security and computational cost are analyzed by utilizing the public data of GeoLife. Analysis results indicate that the proposed scheme would increase no computational cost and communication cost of the system, and with the addition of small-quantity virtual users, the continuity for location privacy service of the users is improved, and it could prevent the attacker from acquring the privacy of the users via the user's history information.%现有的连续LBS查询可能导致攻击者通过截获的多次查询信息得到用户的隐私位置信息.首先对最大移动边界攻击进行分析,然后基于区域划分和虚拟用户方法,通过构造可达匿名区域、混合用户集,提出了一种可以抵御最大移动边界攻击的k匿名隐私保护方法.同时,利用GeoLife的公开数据,进行了安全性和计算代价分析.分析结果表明,该方案不会增加系统的计算成本和通信成本,并在仅增加少量虚拟用户的情况下,提高了用户的位置隐私服务的连续性,且可以防止攻击者通过用户历史信息获得用户的隐私.
展开▼
