Physical Unclonable Function implementation on Arduino-Uno

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I am trying to implement SRAM-PUF on Arduino-Uno, and I saw the following link Accessing SRAM On Arduino Uno .
The discussion was based on dumping 256 bytes from the SRAM. Does this model the SRAM-PUF? I.e. Can I estimate the time of SRAM-PUF by randomly accessing the Arduino-Uno SRAM? Please let me know.

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Implementing a PUF on a Uno is going to be pretty difficult. I don't believe that the RAM contents are very random on power-up, and they certainly aren't after mere "resets."

You'd be better off trying to connect one of the new (and cheap) "security chips."
For example https://www.microchip.com/en-us/products/security/security-ics/cryptoauthentication-family (although I didn't check whether any of those actually provide a PUF capability.)

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Thank you for your reply.

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