The more you understand about Unicode the more you understand how profoundly broken this is http://rot8000.com/Index
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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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What's wrong with rot8000?
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