1-HEMT-1-Memristor With Hardware Encryptor for Privacy-Preserving Image Processing

Efficiency and privacy-preserving are two key requirements in developing computing systems for processing of privacy-related information. Here, we experimentally demonstrate one AlGaN/GaN high-electron-mobility transistor (HEMT) one Au/NbO
_x
/HfO
₂
/Pt memristor (1HT1R) structure, which features sub-8ns latency, < 96 fJ programming energy, 10
⁴
s retention at 85 °C and endurance of >10
⁶
cycles. We further build a hardware encryptor by combining HEMT-implemented XOR gate and a true random number generator (TRNG) based on variation in Pt/SiO
_x
:Ag/Pt memristor. The proposed TRNG is able to generate 0.48Mb random bitstreams with ultralow energy consumption of 50fJ/bit. A memristors-based homomorphic encryption system is thus constructed based on the 1HT1R and hardware encryptor, capable of performing image segmentation with ultrafast speed, low energy consumption, and privacy-preserving capability.