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Active and Passive Electronic Components
Volume 2017 (2017), Article ID 4070589, 8 pages
Research Article

Design Impedance Mismatch Physical Unclonable Functions for IoT Security

Institute of Circuits and Systems, Ningbo University, No. 818 Fenghua Road, Ningbo 315211, China

Correspondence should be addressed to Yuejun Zhang

Received 21 July 2016; Revised 14 November 2016; Accepted 27 December 2016; Published 24 January 2017

Academic Editor: Sourabh Khandelwal

Copyright © 2017 Xiaomin Zheng et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We propose a new design, Physical Unclonable Function (PUF) scheme, for the Internet of Things (IoT), which has been suffering from multiple-level security threats. As more and more objects interconnect on IoT networks, the identity of each thing is very important. To authenticate each object, we design an impedance mismatch PUF, which exploits random physical factors of the transmission line to generate a security unique private key. The characteristic impedance of the transmission line and signal transmission theory of the printed circuit board (PCB) are also analyzed in detail. To improve the reliability, current feedback amplifier (CFA) method is applied on the PUF. Finally, the proposed scheme is implemented and tested. The measure results show that impedance mismatch PUF provides better unpredictability and randomness.