Question

how does the ring oscillator PUF work?
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Answer 1

Answer:

Explanation:

The paper analyzes and proposes some enhancements of Ring-Oscillators-based Physical Unclonable Functions (PUFs). PUFs are used to extract a unique signature of an integrated circuit in order to authenticate a device and/or to generate a key. We show that designers of RO PUFs implemented in FPGAs need a precise control of placement and routing and an appropriate selection of ROs pairs to get independent bits in the PUF response. We provide a method to identify which comparisons are suitable when selecting pairs of ROs. Dealing with power consumption, we propose a simple improvement that reduces the consumption of the PUF published by Suh et al. in 2007 by up to 96.6%. Last but not least, we point out that ring oscillators significantly influence one another and can even be locked. This questions the reliability of the PUF and should be taken into account during the design.

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Answer 2

The working of ring oscillator PUF:

• The ring oscillator is a device which gives output on providing some inputs. In-ring oscillator, not gates are arranged in like a ring therefore it is known as the ring oscillator.
• One of the important applications of the ring oscillator is used as PUF which is also known as Physical unclonable function. RO PUF is combined in an FBGA i.e. field-programmable gate array to get the response in the PUF by selecting some unique pairs of RO I.e. ring oscillator.

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