An alternative to error correction for SRAM-like PUFs

Authors:
Maximilian Hofer;Christoph Boehm
Affiliations:
Institute of Electronics, Graz University of Technology;Institute of Electronics, Graz University of Technology
Venue:
CHES'10 Proceedings of the 12th international conference on Cryptographic hardware and embedded systems
Year:
2010

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Abstract

We propose a new technique called stable-PUF-marking as an alternative to error correction to get reproducible (i.e. stable) outputs from physical unclonable functions (PUF). The concept is based on the influence of the mismatch on the stability of the PUF-cells' output. To use this fact, cells providing a high mismatch between their crucial transistors are selected to substantially lower the error rate. To verify the concept, a statistical view to this approach is given. Furthermore, an SRAM-like PUF implementation is suggested that puts the approach into practice.