Fig. 4: Reconfigurable halide perovskite (HP) memristor physical unclonable functions (memPUFs).
From: Halide perovskite memristors as flexible and reconfigurable physical unclonable functions
a Reconfiguration flowchart showing how reconfiguration is done exploiting cycle-to-cycle variability by resetting to HRS and running through the same protocol again every cycle to generate fresh keys. The PUF is repeatedly reconfigured as long as the correlation factor between the new key and the key from the previous cycle is not low enough. b, c Analog color map and digitized checkerboard before and after one cycle of reconfiguration showing the bits are different after reconfiguration. d 10 cycles of consecutive writes are done for reconfiguration. Histogram of reconfiguration HD obtained by calculating HD of \(\left(\begin{array}{c}10\\ 2\end{array}\right)=45\) pairs of bit-streams, with a mean value of 40.06% showing good independence of the key bits across cycles. e Correlation matrix for 10 cycles of reconfiguration showing an average correlation of 0.2.
