  This paper proposes a 3-input arbiter-based novel physically unclonable
function (PUF) design. Firstly, a 3-input priority arbiter is designed using a
simple arbiter, two multiplexers (2:1), and an XOR logic gate. The priority
arbiter has an equal probability of 0's and 1's at the output, which results in
excellent uniformity (49.45%) while retrieving the PUF response. Secondly, a
new PUF design based on priority arbiter PUF (PA-PUF) is presented. The PA-PUF
design is evaluated for uniqueness, non-linearity, and uniformity against the
standard tests. The proposed PA-PUF design is configurable in
challenge-response pairs through an arbitrary number of feed-forward priority
arbiters introduced to the design. We demonstrate, through extensive
experiments, reliability of 100% after performing the error correction
techniques and uniqueness of 49.63%. Finally, the design is compared with the
literature to evaluate its implementation efficiency, where it is clearly found
to be superior compared to the state-of-the-art.
