Abstract
Fog computing has been introduced as a technology to bridge the gap between remote data centers and Internet of Things (IoT) devices. Enabling a wide range of benefits, including enhanced security, decreased bandwidth, and reduced latency, fog is an appropriate paradigm for many IoT services. Nevertheless, fog devices ( located at the edge of the Internet) obviously face many security and privacy threats. Here, the authors discuss the security and privacy issues in IoT environments and propose a mechanism that employs fog to improve the distribution of certificate revocation information among IoT devices for security enhancement.