Mobile ad-hoc networks require anonymous communications in order to thwart new wireless passive attacks; and to protect new assets of information such as nodes locations, motion patterns, network topology and traffic patterns in addition to conventional identity and message privacy. The transmitted routing messages and cached active routing entries leave plenty of opportunities for eavesdroppers. Anonymity and location privacy guarantees for the deployed ad hoc networks are critical in military and real time communication systems, otherwise the entire mission may be compromised. This poses challenging constraints on MANET routing and data forwarding. To address the new challenges, several anonymous routing schemes have been proposed recently.