Stochastic switching and analog-state programmable memristor and its utilization for homomorphic encryption hardware

Woon Hyung Cheong, Jae Hyun In, Jae Bum Jeon, Geunyoung Kim and Kyung Min Kim ()
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Woon Hyung Cheong: Korea Advanced Institute of Science and Technology (KAIST)
Jae Hyun In: Korea Advanced Institute of Science and Technology (KAIST)
Jae Bum Jeon: Korea Advanced Institute of Science and Technology (KAIST)
Geunyoung Kim: Korea Advanced Institute of Science and Technology (KAIST)
Kyung Min Kim: Korea Advanced Institute of Science and Technology (KAIST)

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Homomorphic encryption performs computations on encrypted data without decrypting, thereby eliminating security issues during the data communication between clouds and edges. As a result, there is a growing need for homomorphic encryption hardware (HE-HW) for the edges, where low power consumption and a compact form factor are desired. Here, a Pt/Ta2O5/Mo metallic cluster-type memristors (Mo-MCM) characterized by the Mo as a mobile species, and its utilization for the HE-HW via a 1-trasistor-1-memristor (1T1M) array as a prototype HE-HW is proposed. The Mo-MCM exhibits inherent stochastic set-switching behavior, which can be utilized for generating the random numbers required for encryption key generation. Furthermore, the device can accurately store analog conductance states after set-switching, which can be used as an analog non-volatile memristor. By simultaneously leveraging these two characteristics, encryption key generation, data encryption, and decryption are possible within a single device through an in-memory computing manner.

Date: 2024
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DOI: 10.1038/s41467-024-50592-7

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