Novel technique to improve strength of weak arbiter PUF

In this paper, we aim at increasing the strength of weak arbiter physical unclonable function (APUF) which are vulnerable to modeling attacks because of low uniqueness and randomness. We propose a unique technique which takes n × 1 challenge-response pairs (CRPs) from APUF and combines them with ring oscillators (ROs) implemented on the same FPGA to get n × n CRPs. We claim the proposed technique to be immune to modeling attacks to a great extent. The experimental results show that the uniqueness and randomness of the APUF increase by at least 19% and 16%, respectively after the implementation of proposed technique.