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A new concept for Physical Unclonable Functions (PUFs), the Mirror PUF, is proposed. The Mirror PUF can be applied to existing preselected PUF circuits by post-processing the preselection test results and has the potential to double the number of effective bits, with no additional area at the bit-cell level. The Mirror PUF utilizes a preselection test, which measures the amount of mismatch within the PUF cell. This data is generally used to determine the mask for a conventional PUF. Here, it is used as an entropy source that is not correlated to the original response of the PUF. Bit-cells with low mismatch are considered as a &#x2018;0&#x2019; and cells with high mismatch as a &#x2018;1&#x2019;. A systematic method is shown for identifying unstable bits in the Mirror PUF response. It classifies the cells to &#x2018;low&#x2019;, &#x2018;medium&#x2019; and &#x2018;high&#x2019; mismatch, such that medium mismatch bits are considered as unstable and masked from the response. The concept was applied to a 65nm Si implementation of the Capacitive Tilt PUF (Shifman et al., 2020). All of the unstable cells of the Mirror PUF, except for 0.03&#x0025;, were identified and masked, with a worst-case corner Bit Error-Rate (BER) of only 2.35E-5 and 0.00026&#x0025; erroneous responses across all corners. The application of the Mirror PUF to the Capacitive tilt PUF increased the number of stable response bits by 66&#x0025;. No observable correlation was found between the responses of the original PUF and the Mirror PUF.

A Method to Utilize Mismatch Size to Produce an Additional Stable Bit in a Tilting SRAM-Based PUF