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@navi@social.vlhl.dev I've always interpreted it as the first, because there are a lot of considerations and caveats with cryptography such as avalanching, reflection, initialization, alignment and padding along with the complexity/entropy of the mathematical equations-- most if not all of which will have been taken into consideration.

but sometimes you have to reimplement the cipher due to either platform availability (i.e. embedded, old consoles) or they're a niche that doesn't exist on the language you're using like most secondary ciphers like almost everything in the eSTREAM project.

there also are concerns about backdooring when using mainline ciphers but that's a conspiracy theory rabbit hole.