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Wireless mobile ad hoc networks (MANET) are an emerging area of mobile computing. Security issues concerning MANET are attracting increasing attention nowadays. MANET is a new wireless networking paradigm without a fixed infrastructure, and includes base stations or mobile switching centers. Mobile nodes rely on each other to maintain the network connection. In this paper, a secured identity-based key exchange protocol is proposed for networks in environments without any public key infrastructure. This investigation proposes a secured key exchange protocol without the auxiliary of certification authority for application to wireless mobile ad hoc networks. This protocol solved the security problem in the MANET and is suitable for application to other wired network structures.