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CHOICE – A Tunable PUF-Design for FPGAs

EasyChair Preprint no. 6297

7 pagesDate: August 14, 2021


FPGA-based Physical Unclonable Functions (PUFs) have emerged as a viable alternative to permanent key storage by turning inaccuracies during the manufacturing process of a chip into a unique, FPGA-intrinsic secret. However, many fixed PUF designs may suffer from unsatisfactory statistical properties in terms of uniqueness, uniformity, and robustness. Moreover, a PUF signature may alter over time due to aging or changing operating conditions, rendering a PUF insecure in the worst case. As a remedy, we propose CHOICE, a novel class of FPGA-based PUF designs with tunable uniqueness and reliability characteristics. By the use of addressable shift registers available on an FPGA, we show that a wide configuration space for adjusting a device- specific PUF response is obtained without any sacrifice of randomness. In particular, we demonstrate the concept of address-tunable propagation delays, whereby we are able to increase or decrease the probability of obtaining ’1’s in the PUF response. Experimental evaluations on a group of six 28 nm Xilinx Artix-7 FPGAs show that CHOICE PUFs provide a large range of configurations to allow a fine-tuning to an average uniqueness between 49% and 51%, while simultaneously achieving bit error rates below 1.5%, thus outperforming state-of-the-art PUF designs. Moreover, with only a single FPGA slice per PUF bit, CHOICE is one of the smallest PUF designs currently available on FPGAs.

Keyphrases: cryptographic key, FPGA, Hardware-oriented security, hardware/software co-design, Physical Unclonable Function, PUF, Security

BibTeX entry
BibTeX does not have the right entry for preprints. This is a hack for producing the correct reference:
  author = {Franz-Josef Streit and Paul Krüger and Andreas Becher and Jens Schlumberger and Stefan Wildermann and Jürgen Teich},
  title = {CHOICE – A Tunable PUF-Design for FPGAs},
  howpublished = {EasyChair Preprint no. 6297},

  year = {EasyChair, 2021}}
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