Towards a trust computing architecture for RPL in Cyber Physical Systems

Cyber Physical Systems (CPSs) are widely expected to be formed of networked resource constrained devices. To suit the constraints of such networks, the IETF developed the RPL routing protocol for Low-power and Lossy Networks (LLNs). Security in CPSs is important for maintaining the integrity and privacy of data, while also improving network resiliency to attacks. Even though RPL provides support for integrity and confidentiality of messages, details regarding key management and signatures are not covered. Since complexity and size is a core concern in LLNs, off-loading the security features to a Trusted Platform Module (TPM) can make it possible to include sophisticated security provisions in an RPL implementation. This paper presents how it would be possible to use the security mechanisms of a TPM in order to secure the communication in an RPL network.