[kapp_in_life]

Not really. It doesn't rely on that big of an assumption, nor does it require nation state resources[0]. When you're trying to find the secret you can make a bunch of requests and measure for statistically significant change, which can still be detectable beyond jitter & web server load.

Also ignoring the fact that calling constant_strcompare(string, string) instead of strcompare(string, string) when working with secrets isn't that big of an ask.

[0] https://crypto.stanford.edu/~dabo/papers/ssl-timing.pdf

[WhiteBlueSkies]

If you could measure the time granularly as a client requesting some resource on the server how exactly would you know the time corresponds to the comparison and not to some tangential task?