Location privacy protection routing for wireless sensor network
无线传感器网络的位置隐私保护路由

When Wireless Sensor Network (WSN) is used to monitor sensitive objects, the location privacy of monitored objects becomes a key issue. When a sensor node reports a monitored object to base station by sending a series of messages through multiple hops, an adversary may trace back the source location. Flooding-based phantom routing has a problem that safety period becomes smaller and energy costs become higher for protecting source-location privacy. In this paper, directed-random-walk-based phantom routing was proposed to make it difficult for an adversary to backtrack hop-by-hop to the origin of the sensor communication. In directed-random-walk-based phantom routing, every message experiences two phases: the first, the same as flooding-based phantom, is a random walk or directed walk, and a subsequent directed-random-walk to deliver the message to the base station. Compared to flooding-based phantom, directed-random-walk-based phantom routing has clearly larger safety period and lower energy costs.