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Memory-based physical unclonable functions (PUFs), top priorities in the hardware security applications, are in the face of limited challenge-response pairs (CRPs). Concerned with this, we propose a differential reconfigurable PUF (rPUF) scheme with phase change memory (PCM) in this paper. By making use of the spontaneous resistant randomness between cycles, a simple but practical method for reconfiguration is realized. 30 PCM chips in 40-nm process are measured for their electrical properties and the PUF system is simulated. Diffuseness, uniqueness and stability of our PUF system are very close to the industry standards according to the experimental results. Meanwhile, system crisis from exhausted CRPs is remarkably decreased by effective entropy of cycling programming when the quantifiable level is increased.

Design and security evaluation of PCM-based rPUF using cyclic refreshing strategy