CLAPPER: Clonable LFSR-based Asymmetric PUF-group with Peer-to-peer Equivalent Response

Traditional physically unclonable function (PUF)-based authentication models that use challenge-response pairs (CRPs) suffer from high storage overhead and an inability to perform n-party authentication. We propose a new clonable PUF (CPUF) for decentralized authentication, wherein both master and slave PUFs share the same dynamic linear feedback shift register (LFSR) value. In this work, only the master PUF possesses an entropy source determined through the variability induced during fabrication, which serves as the seed of the LFSR. Cloning can be achieved at any time and the value of the master PUF is synchronized with the slave PUF over multiple periods via a unidirectional port. Our CPUF model demonstrates that the response exhibits excellent statistical performance, confirming its suitability for secure and scalable authentication involving multiple parties.