Capacitive physically unclonable function

Digital electronic type of physical unclonable functions (PUFs) are vulnerable to modeling attacks. They also suffer from errors due to temporary environmental variations, such as the variation of the ambient temperature. Motivated by that, we designed a new mixed-signal PUF using 45nm MOSFET technology. The design presents an expanding approach for the number of processed bits. The design generates 128-bit output response for each 21-bit input challenge. The design proposes an approach to enable the verifier algorithm to remotely analyze the raw responses and handle their errors with an adaptable tolerance to eliminate the need for on-chip error correcting code. The layout area of the design is 3276 μm² and the average power is 1.05 mW.