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> Testing cannot be used to prove that a flaw doesn't exist, only that it does.

FWIW, I wrote a similar blog post about a different encryption bug that really seemed like it should have been found by fuzzing, and had 100% coverage.

https://googleprojectzero.blogspot.com/2021/12/this-shouldnt...

Not that I disagree with you, just a practical example.

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It's pretty remarkable how effective fuzzing is despite the layers upon layers of optimizations/assumptions that it requires in order to be feasible at all (eg max_len = 10000). I haven't tinkered with fuzzing since afl was a toddler but its mechanism for pruning the test space seemed so brilliant and tweakable at the time.

It would be interesting to find a way to create excursions into these various parameter spaces but some of them are baked into the infrastructure in such a way that it makes it difficult.

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