A comprehensive and lightweight security architecture to secure the IoT throughout the lifecycle of a device based on HIMMO.

Smart objects are devices with computational and communication capabilities connected to the Internet forming the so called Internet of Things IoT. The IoT enables many applications, for instance outdoor lighting control, smart energy and water management, or environmental sensing in a smart city environment. Security in such scenarios remains an open challenge due to the resource-constrained nature of devices and networks or the multiple ways in which opponents can attack the system during the lifecycle of a smart object. This paper firstly reviews security and operational goals in an IoT scenario inspired in a smart city environment. Then, we present a comprehensive and lightweight security architecture to secure the IoT throughout the lifecycle of a device. Our solution relies on the lightweight HIMMO scheme --- a novel key pre-distribution scheme that is both collusion resistance and efficient --- as the building stone enabling not only efficient resource-wise but also advanced and scalable IoT protocols and architectures. Our design and analysis show that our HIMMO-based security architecture can be easily integrated in existing communication protocols such as IEEE 802.15.4 or OMA LWM2M providing a number of advantages that existing solutions cannot provide both performance and operation-wise.