Mobile Ad-hoc Network (MANET) is a self configuring infrastructure-less network of autonomous battery powered mobile nodes connected by low bandwidth wireless links in a dynamic topology. Each node in MANET functions as host as well as router simultaneously and maintains connectivity by distributing the network control among the nodes. Ad-hoc networks are considered important in situations where the installation of a fixed infrastructure is costly, difficult, impossible or simply unnecessary. MANETs are vulnerable to various attacks which can compromise the confidentiality, integrity and authenticity of the exchanged information. This book proposes a fusion of security measures with Ad-hoc On-demand Distance Vector Routing (AODV) protocol, resulting in Secure AODV (SAODV) against various routing attacks such as misrouting, dropping of packets etc. The Black Hole problem is a routing attack when a node pretends itself as a destination node or as an intermediate node having a route to destination and eventually consumes all the data packets that are routed to it. The simulation result shows that SAODV can with stand in the presence of Black Hole Attack and performs satisfactorily.