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With the development of wireless mobile networks, more security issues, such as identity spoof, DoS attack, ARP attack, have been exposed out recently. Meanwhile, mobile nodes require higher performance of handover. However, existing solutions cannot solve the problems flexibly and effectively. In this paper, we present an identity based secure and fast authentication protocol (IBSFAP) for mobile nodes to support their secure and fast handover among different access points. Through experiments and analysis, we find that the proposed protocol has the following merits. First, it can make the mobile nodes and the accessing network establish a mutual trustworthy relationship to avoid any spoof from the other side. Second, it can provide the mobile nodes with a secure and fast handover among different access points very well. Third, the proposed protocol needs less computation and transmission resources to finish its function.