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Increasing the Robustness of TERO-TRNGs against Process Variation
Ist Teil von
ACM transactions on reconfigurable technology and systems, 2023-09, Vol.16 (3), p.1-29
Ort / Verlag
New York, NY: ACM
Erscheinungsjahr
2023
Quelle
ACM Digital Library
Beschreibungen/Notizen
The Transition Effect Ring Oscillator (TERO) is a popular design for building entropy sources because it is compact, built from digital elements only and is very well suited for FPGAs. However, it is known to be very sensitive to process variation. While the latter is useful for building Physical Unclonable Functions, it is interfering with the application as entropy source. In this paper, we investigate an approach to increase reliability. We show that adding a third stage eliminates much of the susceptibility to process variation and how a resulting GHz oscillation can be evaluated on an FPGA. The design is supported by physical and stochastic modeling. The physical model is validated using an experiment with dynamically reconfigurable LUTs.