Spatial Reconfigurable Physical Unclonable Functions for the Internet of Things

Internet of Things (IoT) devices encounter security and resource constrains as two confronting challenges. In this paper we demonstrate a ring oscillator Physical Unclonable Function (PUF) that uses spatial reconfiguration on an FPGA to provide secure authentication for resource constrained IoT devices. We discuss our main design decisions and present an example implementation of our approach. Our experimental evaluations shows that our approach can increase the number of unique challenge response pairs by a factor of six without increasing the size of the PUF implementation takes on the FPGA. This confirms the applicability of our proposed solution.