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Mobile Nodes (MNs) in the Mobile Ad hoc Network (MANET) employ multi-hop relaying techniques to exchange messages. These MNs are not globally reachable by nodes in the Internet. Adding Mobile IP protocol capabilities to MANETs grants the MNs the required Internet reachability. Several security and performance issues are introduced as a result of incorporating MANETs with Mobile IP. In this paper, we propose a secure and efficient multi-hop Mobile IP registration scheme for the MANET-Internet integrated architecture. Our proposed scheme is designed to defend against common security attacks affecting the integrated architecture. Additionally, the scheme outperforms closely competitive schemes reported in the literature in terms of registration delay.