Aiming at problem of source node location privacy protection in wirless sensor networks（WSNs）

a routing protocol for source-location privacy protection based on random virtual ring is proposed. The protocol avoids generation of failure path and extends routing path to the annular region which source node resided with the random virtual ring. It greatly increases the diversity and randomness of the routing path

and make it hard for an attacker to estimate the location of the source node according to the routing path. The simulation results show that under limited time delay

the ability of source-location privacy protection is increased obviously with the protocol.