Research On Source Location Privacy In Wireless Sensor Networks

With the rapid developments of network technology and the grad-ually-increasing security requirements, Source Location Privacy (SLP)of Wireless Sensor Networks (WSNs) catches scholars' great attentions,especially for schemes based on random walk (DROW) and on Geo-graphic Routing. However, existing schemes based on DROW do not consider the balance of each node's energy consumption and the safety period is unstable. What's more, they do not change the data flow either.For schemes based on Geographic Routing, they just consider single parameter and can't be used for all situations. Also, for the research on multi-sources and sources mobility network, there is a gap between the theory and actual applications. To address above problems, from the view of energy, this thesis studies the SLP with single source, mul-ti-sources and source mobility. The main research results are as follows:1) In order to solve the problems such as safety period is unstable and lower limit is very low, we put forward an Energy-Aware Location Privacy Routing Protocol (EALPR). The first part of EALPR is non-repeat polling routing protocol. We build a polling list for each node. In this way, the different nodes can avoid to select the same next node. And the second part is strategy of fake messages based on ener-gy-aware, according to the conception of average residual energy, every node judge it's left energy and then decide to generate fake message or not. The simulation results show that the length of safety period is ex-tended by 20% to 30%. The variance of our protocol is only about one over forty of that based on random-walk. 2) According to the character of the multi-sources network, this thesis provides a Multi-sources and Single Path Phantom Routing (MSPPR), this scheme can be divided in-to two parts: h-hops phantom routing and energy-aware single path routing. In the first stage of MSPPR, we take the inspiration of polling and generates more than one phantom nodes surrounding source node to hide it. And in the second stage, if the node is the node with high resid-ual energy, it generates data flow in another direction under the premise that doesn't import extra fake messages. The safety period is increased by 20% or so. 3) For the source mobility and attacker with stronger vis-ible ability, this thesis puts forward an Energy-aware Geographic Rout-ing Protocol (EGRP). It enhances the MSPPR and solves the problem in MSPPR that energy consumption is high and source location is easy to leak out. Meanwhile, we add the parameters such as distance, angle and energy into the traditional Geographic Routing. A new evaluation standard comes up with. The simulation results show that on the prem-ise of not influence the network lifetime seriously, we extend the safety period by 15% or so.