A mobile ad-hoc network (MANET) is a collection of autonomous nodes that communicate with each other by forming a multi-hop radio network. Routing protocols in MANETs define how routes between source and destination nodes are established and maintained. Multicast routing provides a bandwidth-efficient means for supporting group-oriented applications. The increasing demand for such applications coupled with the inherent characteristics of MANETs (e.g., lack of infrastructure and node mobility) have made secure multicast
routing a crucial yet challenging issue. Recently, several multicast routing protocols (MRP) have been
proposed in MANETs. Depending on whether security is built-in or added, MRP can be classified into two
types: secure and security-enhanced routing protocols, respectively. This paper presents a survey on secure and security-enhanced MRP along with their security techniques and the types of attacks they can confront. A detailed comparison for the capability of the various routing protocols against some known attacks is also presented and analyzed.