SOT-based spintronic platform for unified key generation and intrinsic attack detection
Researchers from Huazhong University of Science and Technology and Hubei University have developed a spin-orbit torque (SOT)-based key generation system that unifies cryptographic key generation, concealment, and attack detection within a single spintronic device platform. By combining physically unclonable function (PUF) behavior with true random number generator (TRNG) functionality, the approach introduces a hardware-rooted security primitive in which key access is intrinsically tied to irreversible physical transformations.
At the core of the system are Ta/CoFeB/MgO/Ta spintronic Hall devices, which simultaneously host two complementary entropy sources. Dynamic entropy arises from stochastic magnetization switching under zero-field conditions, enabling true random number generation. In parallel, static entropy originates from device-to-device variations in the critical switching current caused by fabrication process deviations, allowing the extraction of unique and reproducible cryptographic keys. By applying different excitation conditions, the same physical device can switch between these two modes, generating either random numbers or device-specific keys on demand.
Source: https://www.spintronics-info.com/sot-based-spintronic-platform-unified-key-generation-and-intrinsic-attack
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