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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 inherit characteristics of MANETs (e.g., lack of infrastructure and node mobility) have made secure multicast routing crucial yet challenging issue. Recently, several multicast routing protocols have been proposed in MANETs. This paper presents a comprehensive survey on multicast routing protocols along with their security techniques and the types of attacks they can confront. A comparison for the capability of the various secured multicast routing protocols against the identified attacks is also presented.