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The group key maintenance in MANET is especially risky, because repeated node movement, link breakdown and lower capacity resources. The member movement needs key refreshment to maintain privacy among members. To survive with these characteristics variety of clustering concepts used to subdivide the network. To establish considerably stable and trustable environment fuzzy based trust clustering taken into consideration with Group key management. The nodes with highest trust and energy elected as Cluster Head and it forms cluster in its range. The proposed work analyze secure multicast transmission by implementing Polynomial-based key management in Fuzzy Trust based clustered networks (FTBCA) for secure multicast transmission that protect against both internal and external attackers and measure the performance by injecting attack models.