The more you understand about Unicode the more you understand how profoundly broken this is http://rot8000.com/Index
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But you can't just naïvely rotate Unicode code points. That rotation can lead to unassigned code points, or invalid ones. What about combining characters? Normalization of the output can cause data corruption. So can whitespace flattening
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In the end I used a dumb solution, which was to percent-encode the input and *then* apply the Vigenère cipher to the percent-encoded input. The result looks a little ridiculous, but it was definitely illegible and 100% reversible, which was the important part
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And while I'm at it, can everybody *please* remember to NFD-normalize your strings prior to ROT-13. "Naïveté" should become "Anv̈irgŕ", not "Anïirgé". Otherwise, if the encoded text does get normalized in transit, it'll decode incorrectly to "Nav̈vetŕ"
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You know what? Here's a ROT13 implementation which handles combining characters properly https://qntm.org/files/rot13/rot13.html …
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End of conversation
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