Multibit-generating pulsewidth-based memristive-puf structure and circuit implementation

Seoyeon Choi, Dayoung Kim, Yunyeong Choi, Wookyung Sun, Hyungsoon Shin

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


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.

Original languageEnglish
Article number1446
Pages (from-to)1-15
Number of pages15
JournalElectronics (Switzerland)
Issue number9
StatePublished - Sep 2020

Bibliographical note

Funding Information:
Funding: This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (Nos. NRF-2019R1A2C1084063 and NRF-2020R1I1A1A01065622).

Publisher Copyright:
© 2020 by the authors. Licensee MDPI, Basel, Switzerland.


  • Cross-point array
  • Hardware security
  • Memristor
  • Nanoelectronic
  • Physical unclonable function (PUF)


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