【摘 要】
：
Hardware security primitives that preserve secrets are playing a crucial role in the Internet-of-Things(IoT)era.Existing physical unclonable function(PUF)instantiations,exploiting static randomness,generate challenge-response pairings(CRPs)to produce uniq
【机 构】
：
Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information,Huazh
论文部分内容阅读
Hardware security primitives that preserve secrets are playing a crucial role in the Internet-of-Things(IoT)era.Existing physical unclonable function(PUF)instantiations,exploiting static randomness,generate challenge-response pairings(CRPs)to produce unique security keys that can be used to authen-ticate devices linked to the IoT.Reconfigurable PUFs(RPUFs)with dynamically refreshable CRPs can enhance the security and robustness of conventional PUFs.The in-plane current-driven perpendicular polar-ized nanomagnet switching via spin-orbit torque(SOT)possesses great potential for application to memory and logic,as the write-current path is separate from the read-current path,which naturally resolves the write-read interference.However,the stochastic switching of perpendicular magnetization,without an ad-ditional symmetry-breaking field,would significantly hinder the technological viability of commercial imple-mentations.Here,we report an initialization-free physical RPUF implemented by SOT-induced stochastic switching of perpendicularly magnetized Ta/CoFeB/MgO nanodevices.Using a 15×15 nanomagnet ar-ray,we experimentally demonstrate a security primitive that offers a near-ideal 50％uniqueness over 100 reconfiguration cycles,as well as a low correlation coefficient between every two reconfiguration cycles.Our results show that current-induced nanomagnets switching paves the way for developing highly reliable and energy-efficient reconfigurable cryptographic primitives with a smaller footprint.
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