A Cautionary Note When Looking for a Truly Reconfigurable Resistive RAM PUF
Keywords:physically unclonable function, reconfigurable, nonvolatile memory, resistive RAM
AbstractThe reconfigurable physically unclonable function (PUF) is an advanced security hardware primitive, suitable for applications requiring key renewal or similar refresh functions. The Oxygen vacancies-based resistive RAM (RRAM), has been claimed to be a physically reconfigurable PUF due to its intrinsic switching variability. This paper first analyzes and compares various previously published RRAM-based PUFs with a physics-based RRAM model. We next discuss their possible reconfigurability assuming an ideal configuration-to-configuration behavior. The RRAM-to-RRAM variability, which mainly originates from a variable number of unremovable vacancies inside the RRAM filament, however, has been observed to have significant impact on the reconfigurability. We show by quantitative analysis on the clear uniqueness degradation from the ideal situation in all the discussed implementations. Thus we conclude that true reconfigurability with RRAM PUFs might be unachievable due to this physical phenomena.
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Copyright (c) 2018 Kai-Hsin Chuang, Robin Degraeve, Andrea Fantini, Guido Groeseneken, Dimitri Linten, Ingrid Verbauwhede
This work is licensed under a Creative Commons Attribution 4.0 International License.