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The Mobile Ad hoc Network composed of one or more mobile node in the wireless medium. The wireless medium has a lot of security vulnerability, therefore diverse attacks happen. To securely communicating, MANET needs to authenticate each other node. However, providing an authentication is difficult in mobile ad hoc network, because the central node is absent. Among the methods to solve the problem, a localized certificate service has studied. The localized certification service provides an authentication, grouping mobile nodes to local. In this paper, we propose a mechanism for regenerating CGA using a threshold secret sharing in MANET. The proposed mechanism provides more secure communication.