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Open AccessArticle

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

Department of Electronic and Electrical Engineering, Ewha Womans University, Seoul 03760, Korea
Department of Electrical and Computer Engineering, Seoul National University, Seoul 08826, Korea
Authors to whom correspondence should be addressed.
Electronics 2020, 9(9), 1446;
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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