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Mobility support in 6LoWPAN increases the fault tolerance capacity, connectivity, allows extending and adapting network to changes of location and infrastructure. These features are necessary to satisfy the dependability and scalability of the networks of the future world. Several solutions have been developed to support mobility, but they present limitations mainly caused by the role of IP address as both node ID for session determination in the application/transport layer, and Locator in the network layer. For that reason, our proposal is based on one of the first ID/Locator split architectures with 6LoWPAN support, which has defined compressed and size optimized mobility signalling. The mentioned approach presents several security challenges, since ID/Locator management messages are potentially dangerous, for example a malicious host might be able to establish false updates of the location, thereby preventing some packets from reaching their intended destination, diverting some traffic to the intruder, or flooding third parties with unwanted traffic. For that reason, in this paper is carried out a security analysis and proposed a novel secure mobility management scheme considering the requirements and constrains from the Future Internet of Things networks. The proposed scheme is based on an extension of the Return Rout ability process with ECC-based asymmetric cryptography, in order to carry out scalable inter-domain authentication for all the parties involved in the location update, home registration and binding transfer processes.