Fast and Reliable PUF Response Evaluation from Unsettled Bistable Rings

Robert Hesselbarth, Georg Sigl

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Scopus citations

Abstract

Bistable ring (BR) based strong PUFs are promising candidates for lightweight authentication applications. It has been observed that a good '0'/'1'-balance of their responses correlates with longer settling times. This is problematic, since the state-of-the-art evaluation method requires the BR to be settled in order to generate a reliable PUF response. We show that settling times can easily extend beyond 100 milli seconds for 70 percent of the responses in the TBR PUF, which is a BR-based PUF with good '0'/'1'-balance characteristics. Hence, it is practically impossible to wait for all BRs to settle, which results in a reliability penalty. In order to solve this problem, we present three new methods, which allow the evaluation of unsettled BRs with increased reliability compared to the state-of-the-art method. We were able to achieve evaluation times down to 1 micro second and improve response reliability from 80 percent to up to 98.5 percent. This enables the fast and reliable use of BR-based PUFs in strong PUFs applications.

Original languageEnglish
Title of host publicationProceedings - 19th Euromicro Conference on Digital System Design, DSD 2016
EditorsParis Kitsos
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages82-90
Number of pages9
ISBN (Electronic)9781509028160
DOIs
StatePublished - 26 Oct 2016
Event19th Euromicro Conference on Digital System Design, DSD 2016 - Limassol, Cyprus
Duration: 31 Aug 20162 Sep 2016

Publication series

NameProceedings - 19th Euromicro Conference on Digital System Design, DSD 2016

Conference

Conference19th Euromicro Conference on Digital System Design, DSD 2016
Country/TerritoryCyprus
CityLimassol
Period31/08/162/09/16

Keywords

  • FPGA
  • Physical Unclonable Function
  • Twisted Bistable Ring PUF
  • Unsettled Bistable Ring

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