Lightweight Enhanced Collaborative Key Management Scheme for Smart Home Application

Key management is required to secure the smart home application in the context of Internet of Things (IoT). But, these applications might be unable to use existing Internet key management protocols because of the presence of resource limited nodes. In this paper, we propose a lightweight and secure key management scheme for smart homes. This solution is based on an existing collaborative scheme used to secure communication between a limited node and the network central device by offloading highly consuming cryptographic primitives to proxy nodes. To improve the security of this scheme, we propose to limit the participation in key derivation to the trustful proxies by integrating a trust management system. To assess our proposed solution, we introduce a security evaluation using Scyther tool and a formal validation concerning security properties. Then, we evaluate the computational costs to highlight energy savings.