无线传感器网络中的位置隐私保护

Location Privacy Protecting in Wireless Sensor Network

随着无线传感器网络的广泛应用,隐私成为无线传感器网络成功使用的主要障碍。当无线传感器网络用于监控敏感对象,被监控对象的位置隐私成为一个重要问题。在传感节点发送一系列分组,通过多跳,向基站报告监控对象时,敌手能够反向追踪分组到信息源位置。基于洪泛的幻影具有消息发送时间长且能量消耗过大的缺陷。为了保护能量受限的无线传感器网络中的位置隐私,提出了定向随机步。定向随机步使敌手难于跳到跳地反向追踪信息源。在定向随机步中,信源节点发出一个分组,此分组被单播给信源节点的父节点。当中介节点收到一个分组,它以等概率的方式转发给它的一个父节点。与基于洪泛的幻影相比,定向随机步具有较小的信息发送时间和较低的能量消耗。特别在中介节点具有多个父节点的情形下,定向随机步具有较大的安全期。

As wide applications of wireless sensor networks, privacy concerns have emerged as the main obstacle to success. When wireless sensor networks are used to monitor sensitive objects, the privacy about monitored object locations becomes an important issue. When a sensor node reports a monitored object to base station by sending a series of packets through multiple hops, an adversary may trace back the sources location. Flooding-based phantom has a problem that message latencies become larger and energy costs become higher for protecting source-location privacy. In this paper, Directed Random Walk is proposed to make it difficult for an adversary to backtrack hop-by-hop to the origin of the sensor communication. In Directed Random Walk , the source sensor sends out a packet, the packet is unicasted to its parent node. When intermediate node receives a packet, it forwards to one of its parent nodes in a directed random fashion. Compared to Flooding-based phantom, Directed Random Walk has smaller message latencies and lower energy costs. Especially, Directed Random Walk has bigger safety period when intermediate node has multi-parent-nodes.