Mobile adhoc network (MANET)is a type of wireless network. It is a open network environment, in other words it is a infrastructreless network. So any node can join and leave in the network freely. Security is the primary concern in the wireless medium. Major functionality of MANET is protecting the data bits which transfer from one node to another node. Because of its dynamic nature MANET is not much secure than wired network. To overcome this problem, cluster based certificate revocation with vindication capability is proposed. In this paper we present the cluster based architecture is used to construct the topology and provide better security for data transfer in MANET Index Terms-MANT, certificate , revocation, open network