Date Added: Mar 2013
Privacy-preserving routing is crucial for some ad hoc networks that require stronger privacy protection. A number of schemes have been proposed to protect privacy in ad hoc networks. However, none of these schemes offer complete unlinkability or unobservability property since data packets and control packets are still linkable and distinguishable in these schemes. In this paper, the authors define stronger privacy requirements regarding privacy-preserving routing in mobile ad hoc networks. Then they propose an unobservable secure routing scheme PPRP to offer complete unlinkability and content unobservability for all types of packets. PPRP is efficient as it uses a novel combination of group signature and ID-based encryption for route discovery.