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