A Fine-Grained Access Control Scheme in Fog-IoT Based Environment

Fog computing becomes an essential part in IoT-based environment, it offers computing and storage resources at the edge of the network making applications and services more efficient. However, it belongs to a system loaded with security challenges and it is expected to help with its characteristics. On the other side, attribute based encryption is a rising solution that offers a fine-grained access control over encrypted data. Nonetheless, the calculation costs remains heavy and hard to be performed especially in a constrained environment. In this paper, we propose an access control scheme based on cipher-text policy attribute based encryption (CP-ABE) in an IoT-fog based environment by outsourcing the bulk of the calculation to the fog computing layer after a symmetric encryption performed by the devices. Moreover, we propose a verifiability mechanism and an attribute based keymanagement scheme tomaintain a fine-grained access control. The tests show that compared to other outsourcing schemes, the execution times on the IoT devices in our work are shorter and tolerable.