this post was submitted on 17 Jul 2023
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They may just base their limit on one or a few block sizes of the hash function.
That sounds incredibly unlikely. I would be good money that 99% of password length limits are not based on concrete limits. Things like "100 should be enough 🤷" must be way more common.
I doubt 1% of programmers are away of their hashes block size. It is also probably irrelevant since after the first round everything is fixed size anyways.