Reconfigurable Physically Unclonable Functions Based on Nanoscale Voltage‐Controlled Magnetic Tunnel Junctions
Reconfigurable Physically Unclonable Functions Based on Nanoscale Voltage‐Controlled Magnetic Tunnel Junctions
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DOI：
10.1002/aelm.202300195
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发表时间：
2023-06
影响因子：
6.2
通讯作者：
Yixin Shao;N. Dávila;F. Ebrahimi;J. Katine;G. Finocchio;P. Khalili Amiri
中科院分区：
文献类型：
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作者：
Yixin Shao;N. Dávila;F. Ebrahimi;J. Katine;G. Finocchio;P. Khalili Amiri
随着物联网（IoT）上电子设备数量的快速增长，基于硬件的安全原语（例如物理不可克隆函数（PUF））的出现，以克服传统基于软件的加密技术的缺点。现有的 PUF 利用半导体铸造技术中的制造工艺变化。这会导致静态的质询-响应行为，从而可能带来长期的安全风险。这项研究展示了一种基于纳米级磁隧道结 (MTJ) 阵列的可重构 PUF，该阵列利用压控磁各向异性 (VCMA) 诱导的随机动力学来生成真正的随机位。在具有 10 × 10 MTJ 阵列的单芯片上使用 10 ns 电压脉冲总共实现了 100 个 PUF 实例。利用 VCMA 机制的单极性质来稳定 MTJ 状态并消除读出期间的误码。所有 PUF 实例的熵接近 1，汉明间距离接近 50%，并且在 104 次重复读出测量中没有比特错误。
With the fast growth of the number of electronic devices on the internet of things (IoT), hardware‐based security primitives such as physically unclonable functions (PUFs) have emerged to overcome the shortcomings of conventional software‐based cryptographic technology. Existing PUFs exploit manufacturing process variations in a semiconductor foundry technology. This results in a static challenge–response behavior, which can present a long‐term security risk. This study shows a reconfigurable PUF based on nanoscale magnetic tunnel junction (MTJ) arrays that uses stochastic dynamics induced by voltage‐controlled magnetic anisotropy (VCMA) for true random bit generation. A total of 100 PUF instances are implemented using 10 ns voltage pulses on a single chip with a 10 × 10 MTJ array. The unipolar nature of the VCMA mechanism is exploited to stabilize the MTJ state and eliminate bit errors during readout. All PUF instances show entropy close to one, inter‐Hamming distance close to 50%, and no bit errors in 104 repeated readout measurements.