Paper 2020/145
Self-Secured PUF: Protecting the Loop PUF by Masking
Lars Tebelmann, Jean-Luc Danger, and Michael Pehl
Abstract
Physical Unclonable Functions (PUFs) provide means to generate chip individual keys, especially for low-cost applications such as the Internet of Things (IoT). They are intrinsically robust against reverse engineering, and more cost-effective than non-volatile memory (NVM). For several PUF primitives, countermeasures have been proposed to mitigate side-channel weaknesses. However, most mitigation techniques require substantial design effort and/or complexity overhead, which cannot be tolerated in low-cost IoT scenarios. In this paper, we first analyze side-channel vulnerabilities of the Loop PUF, an area efficient PUF implementation with a configurable delay path based on a single ring oscillator (RO). We provide side-channel analysis (SCA) results from power and electromagnetic measurements. We confirm that oscillation frequencies are easily observable and distinguishable, breaking the security of unprotected Loop PUF implementations. Second, we present a low-cost countermeasure based on temporal masking to thwart SCA that requires only one bit of randomness per PUF response bit. The randomness is extracted from the PUF itself creating a self-secured PUF. The concept is highly effective regarding security, low complexity, and low design constraints making it ideal for applications like IoT. Finally, we discuss trade-offs of side-channel resistance, reliability, and latency as well as the transfer of the countermeasure to other RO-based PUFs.
Note: The paper was published at COSADE 2020.
Metadata
- Available format(s)
-
PDF
- Publication info
- Published elsewhere. COSADE 2020
- DOI
- 10.1007/978-3-030-68773-1_14
- Keywords
- Physically Unclonable FunctionSide-Channel AnalysisRO PUFLoop PUFMaskingCountermeasureIoT
- Contact author(s)
- lars tebelmann @ tum de
- History
- 2021-02-10: revised
- 2020-02-10: received
- See all versions
- Short URL
- https://ia.cr/2020/145
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2020/145,
author = {Lars Tebelmann and Jean-Luc Danger and Michael Pehl},
title = {Self-Secured {PUF}: Protecting the Loop {PUF} by Masking},
howpublished = {Cryptology {ePrint} Archive, Paper 2020/145},
year = {2020},
doi = {10.1007/978-3-030-68773-1_14},
url = {https://eprint.iacr.org/2020/145}
}
