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Open AccessArticle

Multibit-Generating Pulsewidth-Based Memristive-PUF Structure and Circuit Implementation

1
Department of Electronic and Electrical Engineering, Ewha Womans University, Seoul 03760, Korea
2
Department of Electrical and Computer Engineering, Seoul National University, Seoul 08826, Korea
*
Authors to whom correspondence should be addressed.
Electronics 2020, 9(9), 1446; https://doi.org/10.3390/electronics9091446
Received: 7 August 2020 / Revised: 29 August 2020 / Accepted: 1 September 2020 / Published: 4 September 2020
(This article belongs to the Special Issue Cyber Security for Internet of Things)
As Internet of Things (IoT) devices have evolved, physical unclonable functions (PUFs) have become a popular solution for hardware security. In particular, memristor devices are receiving attention as suitable candidates for reliable PUFs because they can be integrated into nano-cross point array circuits with ultra-high efficiency. However, it has been found that typical 1-bit generating PUFs consume too many challenge–response pairs (CRPs) to generate a single response. This issue has to be overcome to construct a strong and reliable PUF with a large number of valid CRPs. We suggest a bank design and quantizing entropy source method for constructing a multibit-generating PUF. In this paper, we propose a new pulsewidth-based memristive PUF (pm-PUF) architecture that incorporates analog memristor devices and a nano-cross point array. We describe the architecture’s circuit implementation and its operating process in detail. We also evaluate the inter and intra performances of the pm-PUF in terms of randomness, diffuseness, uniqueness, and steadiness to show that the proposed pm-PUF will be a promising solution for a high-density hardware security system. View Full-Text
Keywords: hardware security; physical unclonable function (PUF); cross-point array; nanoelectronic; memristor hardware security; physical unclonable function (PUF); cross-point array; nanoelectronic; memristor
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Choi, S.; Kim, D.; Choi, Y.; Sun, W.; Shin, H. Multibit-Generating Pulsewidth-Based Memristive-PUF Structure and Circuit Implementation. Electronics 2020, 9, 1446.

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