IoT Resource Access utilizing Blockchains and Trusted Execution Environments

Abstract

We consider IoT resources with a Trusted Execution Environment (TEE) and propose a model to provide trusted resource access that is linked to blockchain payments, ensuring the integrity and confidentiality of the IoT data. The model is built on the widely used OAuth 2.0 open authorization framework, which provides delegated authorization for IoT resources. We utilize hash-lock and time-lock mechanisms to cryptographically link trusted resource access, provided by the IoT resource's TEE, to authorization grants and blockchain payments. The model is implemented in the OP-TEE open source port for the Raspberry Pi that uses ARM's TrustZone and is evaluated on the Rinkeby public Ethereum testnet.